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How to calculate angles

How do I calculate 2 angles in a scalene triangle when the third angle is 76 degrees?

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You need more information to be able to solve resolve the triangle.
All you can say is that the sum of the measures of the two unknown angles is
sum of values of the two angles =(180-76) degrees.

Posted on Nov 21, 2013

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Posted on Jan 02, 2017

SOURCE: finding the length of a triangle

might try

(54tan)/45

I don't have a calc that will do it or I would try it and see.

Posted on Aug 01, 2008

Elessaelle
  • 122 Answers

SOURCE: given a length of 30 cm on the x axis and a length

Yes, there is shortcut because this is right triangle, so you can use Pythagorean theorem (see picture).

  1. Length of hypotenuse is square root of sum of squares of lengths of other two sides of triangle, which is equal to square root of 30^2+10^2=31.6 cm.
  2. Sin(a)=longer cathetus/hypotenuse=0.949 so a=arcsin(0.949)=71.6 degrees
  3. Finally b=90-a=18.4 degrees.
elessaelle.png

If this was helpful please rate 4 thumbs :)

Posted on Sep 05, 2011

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Question. a triangle with two sides 1700mm each with a 45 degree angle. what will the length be of the third side?


If 2 angles are 45 degrees, the other must be 90, so Pythagorus' Theorem applies, so it is sqrt ( 1700^2 + 1700^2 ) = 2404.16
or
for triangles, a / sinA = c / sinC so c = ( 1700 / sin (45) ) * sin (90) = 2404.16.

Oct 31, 2016 | The Computers & Internet

1 Answer

For a 10ft radius octagon, how long should each side be?


There is probably a formula for this or other ways of doing this, but I will give it a shot.

An octagon has 8 sides (octopus has 8 legs). To make an octagon, we effectively have 8 triangles joined at the centre. In the centre, we have 8 equal angles. Since a full circle is 360 degrees, each of these angles must be 360 / 8 or 45 degrees.

Now we can just focus on one of these triangles. We have an angle of 45 degrees at the centre and two arms extending out 10 feet.

At this point, we can use the cosine law to calculate the length of the side or we can recognize that it is an isosceles triangle and work out the other angles and determine the length of the side.

Using Cosine Law, a^2= b^2 + c^2 - 2xbxc Cos A
In this case, A = 45 degrees, b = 10 feet, c=10 feet.

Good luck.

Let me know if you have any questions.

Paul



25836710-svfkql4tdyrcdjnxkdbmy0mo-3-0.jpg

Aug 25, 2015 | Miscellaneous

2 Answers

Can a scalene triangle have a volume of 24


A scalene triangle has sides that are all different lengths, as well as different angles as well.

Volume?? would be an amount that would be a liquid, usually.

Apr 08, 2015 | Miscellaneous

1 Answer

If two of the angles on a triangle were 90 degree and 45 degree, what kind of triangle would it be


The third angle will be 45 degrees. You have an isosceles right triangle.

Mar 13, 2014 | Computers & Internet

1 Answer

Their are three angle d first one is 128 degree, the second one is 37 degree, find x


I presume that x is the measure in degrees of the third angle. Use the fact the sum of the interior angle of a triangle is equal to 180 degrees.
x+128+37=180
x+165=180
x=180-165=15 degrees.

Sep 16, 2013 | Office Equipment & Supplies

1 Answer

A scalene triangle has side measuremnts a=43, b=55, c=30 . Angle a plus Angle b must equal 43. Angle b plus Angle c must equal 55. Angle c plus Angle a must equal 30.


Answer: angle a=9 degree angle b=34 degree angle c=21 degree Explanation: we have, a+b=43............(1) c+b=55..............(2) c+a=30..............(3) from (3) we get, c=30-a...........(4) substituting value of c from (4) in (2) we get, 30-a+b=55.........(5) a+b=43..........(1) (5)-(1) give 30-2a=12 30-12=2a a=18/2=9 degree giving value of 'a' in (1) 9+b=43 b=34 degree similarly giving value of 'a' in (3) c+9=30 c=21 degree

Oct 14, 2012 | TOPICS Entertainment Snap! Geometry...

2 Answers

How can you classify a triangle according to it angle? is there a formula for it


Well, there is classification by sides, equilateral with 3 equal sides, Isosceles with two equal sides, and scalene with no equal sides, but you talk about angles, but I wanted to point out equilaterals have 3 equal angles, isoceles have 2 equal angles and scalene have no equal angles.
So, now we talk about angles: a Right trianlge has one angle that is 90 degrees, an Obtuse triangle has one angle greater than 90 degrees, and an Acute has no angles over 90 degrees.
Thus, it is possible to have a (scalene or isoceles) AND (acute, obtuse, or right) triangle, but never an equilateral AND (obtuse or right). The angles can't be equal and 90+ degrees if all three must equal 180 degrees.

Oct 06, 2012 | Mathsoft StudyWorks! Middle School Deluxe...

1 Answer

Given a length of 30 cm on the x axis and a length of 10 cm on the y axis and a angle of 90 at the x/y axis intersection is there a short cut to calculate interior angles and hypot. of the triangle?


Yes, there is shortcut because this is right triangle, so you can use Pythagorean theorem (see picture).
  1. Length of hypotenuse is square root of sum of squares of lengths of other two sides of triangle, which is equal to square root of 30^2+10^2=31.6 cm.
  2. Sin(a)=longer cathetus/hypotenuse=0.949 so a=arcsin(0.949)=71.6 degrees
  3. Finally b=90-a=18.4 degrees.
elessaelle.png

If this was helpful please rate 4 thumbs :)

Sep 05, 2011 | Texas Instruments TI-30XA Calculator

1 Answer

1. calculation for excel spreadsheet macro for calculating the a right angle triangles hypotinuse and opposite side, angle given


Hello this is Baris,
First off all when you say hypotinuse I think it is a 90 Degree triangle. Total of the angles off a triangle is 180 degree. So it is a simple algebra question.

Hypotinuse is 90
Right angle is R
Left angle is L
Total is 180

Equation is 90+ R +L = 180

We are looking for R, so lets arrange our equation.

R= 180 - 90 - L
R= 90 - L

This is our formula for excel

Lets put it in the excel
Type in A1 "hypotinuse "
Type in A2 "Left Angle"
Type in A3 "Right Angle"

Type in B1 90
Type in B2 "whatever the value given for the left angle"
Type in B3 =90-B2

As soon as you change the value in the cell B2, B3 will change by itself. Hope this helps :)


Sep 27, 2009 | Microsoft Excel for PC

2 Answers

Finding the length of a triangle


might try

(54tan)/45

I don't have a calc that will do it or I would try it and see.

Jul 31, 2008 | Office Equipment & Supplies

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