Question about Casio FX-115ES Scientific Calculator

SOURCE: subtracint measurements

just convert the inches to decimals (12ths) approx. .08333

Posted on Mar 05, 2009

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Posted on Jan 02, 2017

area formula is PI x r squared

that is 3.1417 times the radius of the circle squared

example is:- 3.1417 times 3 inches squared =3.1417 times 3x3=3.1417x9=28.279 square inches if you want to work back from a circumference measurement, the formula for circumference is 2 x PI x radius or PI x diameter

if you have a circumference of 12 inches then the dia is calculated 12 inches = dia x PI to get the diameter , divide the 12 inches by PI and that will be the diameter so that is 12 divided by 3.1417 =3.819 inches

now you can go from the first formula the radius is the diameter divided by 2 so the radius will be 3.819 divided by 2 = 1.909 inches

so applying the area formula it becomes 3.1417 times 1.909 times 1.909 =11.458 square inches

to find your answer simply substitute the dimensions in place of the example figures.in the relevant formula.

that is 3.1417 times the radius of the circle squared

example is:- 3.1417 times 3 inches squared =3.1417 times 3x3=3.1417x9=28.279 square inches if you want to work back from a circumference measurement, the formula for circumference is 2 x PI x radius or PI x diameter

if you have a circumference of 12 inches then the dia is calculated 12 inches = dia x PI to get the diameter , divide the 12 inches by PI and that will be the diameter so that is 12 divided by 3.1417 =3.819 inches

now you can go from the first formula the radius is the diameter divided by 2 so the radius will be 3.819 divided by 2 = 1.909 inches

so applying the area formula it becomes 3.1417 times 1.909 times 1.909 =11.458 square inches

to find your answer simply substitute the dimensions in place of the example figures.in the relevant formula.

Aug 24, 2015 | Office Equipment & Supplies

Assume the central angle is 35 degrees and the radius is 1.

The circumference of the whole circle is 2 x pi x radius. Since the radius is 1, the circumference will be 2 x pi.

Now a full circle is 360 degrees.

Now we can set up a ratio of 35 degrees is to 360 degree as x is to 2pi.

35 x

---- = -------

360 2xpi

Cross-multiply and isolate your variable.

Good luck.

Paul

The circumference of the whole circle is 2 x pi x radius. Since the radius is 1, the circumference will be 2 x pi.

Now a full circle is 360 degrees.

Now we can set up a ratio of 35 degrees is to 360 degree as x is to 2pi.

35 x

---- = -------

360 2xpi

Cross-multiply and isolate your variable.

Good luck.

Paul

Mar 25, 2015 | Office Equipment & Supplies

Circumference of a Circle: 2 x pi x radius - OR - pi x diameter,

or if you need some sphere calculations?

Sphere Surface Area: 4 X pi X radius squared OR

pi X diameter squared Sphere Volume: 4/3 X pi X radius cubed OR

( pi X diameter cubed ) / 6

By the way.......... "pi" = 3.1415926536

or if you need some sphere calculations?

Sphere Surface Area: 4 X pi X radius squared OR

pi X diameter squared Sphere Volume: 4/3 X pi X radius cubed OR

( pi X diameter cubed ) / 6

By the way.......... "pi" = 3.1415926536

Apr 29, 2014 | Office Equipment & Supplies

I will not try to guess what that diameter represents, so I will give you all mensuration formulas for the area of a regular polygon.

**s** is the measure of the side,** r** the radius of the inscribed circle, **R** the radius of the circumscribed circle, and **n** the number of sides.

If the angle unit in your calculator is the degree, use 180 instead of Pi. Use the formulas with PI if angle unit is set to radians.

In the formulas on the last line of the display screen (the formulas with sine functions) the radius r should be R (circumscribed circle radius). cot is the reciprocal of the tangent function**(cot(x)=1/tan(x) )**

If the angle unit in your calculator is the degree, use 180 instead of Pi. Use the formulas with PI if angle unit is set to radians.

In the formulas on the last line of the display screen (the formulas with sine functions) the radius r should be R (circumscribed circle radius). cot is the reciprocal of the tangent function

Apr 14, 2014 | Office Equipment & Supplies

If you know the center, measure the distance between the center and one point on the circumference. Measure with the opening of a compass and report on a ruler, or use a ruler.

Take the measure of the radius and multiply by 2. Any other indirect way of getting the radius does not constitute a measure but a calculation.

The diameter of a circle enters in two formulas.

Length of Circumference: C=Pi*D (D diameter) ====>**D=C/Pi**

Area of the disk A=Pi *D^2/4 =====>**D=SQRT(4*A/Pi)**, SQRT is the square root operation.

Take the measure of the radius and multiply by 2. Any other indirect way of getting the radius does not constitute a measure but a calculation.

The diameter of a circle enters in two formulas.

Length of Circumference: C=Pi*D (D diameter) ====>

Area of the disk A=Pi *D^2/4 =====>

Dec 31, 2013 | Office Equipment & Supplies

About 146 and a half degrees.

If this is homework, be sure to show your work.

If this is homework, be sure to show your work.

Oct 22, 2013 | Office Equipment & Supplies

Press [2nd][PGRM] to open the (DRAW) utility. Scroll down to reach the line 9: Circle( and press ENTER. Complete the command by supplying the coordinates of the circle center and the radius.

Circle(0,0,4) draws a circle with center at the origin (0,0) and radius 4.

By the way the equation of a circle is not a function. You have to cut it into the upper brach and the lower part to graph it.

y=+SQRT(16-x^2) and y=-SQRT(16-x^2)

Circle(0,0,4) draws a circle with center at the origin (0,0) and radius 4.

By the way the equation of a circle is not a function. You have to cut it into the upper brach and the lower part to graph it.

y=+SQRT(16-x^2) and y=-SQRT(16-x^2)

Sep 01, 2011 | Texas Instruments TI-84 Plus Silver...

You can not do it unless you know the measure of the central angle sustending (supporting) the arc. If the angle is known, you use the proportionality relation that follows:

If angle is in degrees

(length of arc) / circumference=(measure of central angle sustending arc)/360.

Here the circumference is 2*PI*radius.

If angle is in radians , the relation is somewhat simpler,

**arc length= (radius length)* (angle measure in radians)**

It is clear that in the last relation, the unit for the arc length is the same as the unit for the radius.

If angle is in degrees

(length of arc) / circumference=(measure of central angle sustending arc)/360.

Here the circumference is 2*PI*radius.

If angle is in radians , the relation is somewhat simpler,

It is clear that in the last relation, the unit for the arc length is the same as the unit for the radius.

Jul 15, 2011 | Casio FX-300MS Calculator

Pi is a mathematical constant whose value is the ratio of any Euclidean plane circle's
circumference to its diameter; this is the same value as the ratio of a
circle's area to the square of its radius. It is approximately equal to
3.14159265 in the usual decimal notation.

Mar 05, 2011 | Casio FX82MS Scientific Calculator

assuming the question is what is the circle equation?

and if (-2,2) is the center of the circle

the equation should look like this: (x+2)^2+(Y-2)^2=R^2

And now only R is needed.

given 2x-5y+4=0 equation of line perpendicular

we can rearange the equation to be y=(2x+4)/5

from that we can see that the slope of the line is 2/5

And from the fact of perpendicular line we can say that the slope

of the radius line is -2/5.

The motivation now is to calculate the distance between the center of the circle to the cross point of the radius with the line perpendicular

For that we would calculate the radius line equation and compare it to the equation of line perpendicular

As mentioned earlier the slope of the radious line is -2/5.

So the equation is y=-2/5x+b and b can be calculated by using the center of the circle coordinates

2= - (2/5)*(-2)+b ------> b=2-4/5=1.2

radius equation is y=-(2/5)x+1.2

Now the cross point is calculated by comparing the equations:

-(2/5)x+1.2=(2x+4)/5 --> -2x+6=2x+4 --> 4x=2 --> x=1/2 --> y=1

So the cross point is (1/2,1).

The distance between the points is calculated by the following

Formula:

R=SQR(((1/2)-(-2))^2+(2-1)^2)=SQR(2.5^2+1^2)=SQR(6.25+1)=

SQR(7.25)

Therefore the circle eq is (x+2)^2+(Y-2)^2=7.25

and if (-2,2) is the center of the circle

the equation should look like this: (x+2)^2+(Y-2)^2=R^2

And now only R is needed.

given 2x-5y+4=0 equation of line perpendicular

we can rearange the equation to be y=(2x+4)/5

from that we can see that the slope of the line is 2/5

And from the fact of perpendicular line we can say that the slope

of the radius line is -2/5.

The motivation now is to calculate the distance between the center of the circle to the cross point of the radius with the line perpendicular

For that we would calculate the radius line equation and compare it to the equation of line perpendicular

As mentioned earlier the slope of the radious line is -2/5.

So the equation is y=-2/5x+b and b can be calculated by using the center of the circle coordinates

2= - (2/5)*(-2)+b ------> b=2-4/5=1.2

radius equation is y=-(2/5)x+1.2

Now the cross point is calculated by comparing the equations:

-(2/5)x+1.2=(2x+4)/5 --> -2x+6=2x+4 --> 4x=2 --> x=1/2 --> y=1

So the cross point is (1/2,1).

The distance between the points is calculated by the following

Formula:

R=SQR(((1/2)-(-2))^2+(2-1)^2)=SQR(2.5^2+1^2)=SQR(6.25+1)=

SQR(7.25)

Therefore the circle eq is (x+2)^2+(Y-2)^2=7.25

Oct 26, 2008 | Casio FX-115ES Scientific Calculator

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