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Posted on Jan 02, 2017
A squared + B squared = C squared
15 squared + 15 squared = C Squared
225 + 225 = c squared
450 = c squared
the square root of 450 is 21.21320433
Posted on Apr 30, 2009
cos A = adjacent/hypotenuse
A = Inverse cos (19/24) = 37.66
P.S. Also, make sure your calculators settings is in degrees (not radians or grads)
Posted on Jun 24, 2011
Yes, there is shortcut because this is right triangle, so you can use Pythagorean theorem (see picture).
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Posted on Sep 05, 2011
If you have learned about the trigonometric ratios (sine, cosine and tangent) you can use the tangent of the angle.
Let your run be to the right ( along the positive x-axis) and the rise be upwards along the positive y-axis. The tangent of the angle is
If the calculator is set with angle unit in degrees, the angle is obtained as the arc tangent of the (rise/run) value.
theta= arctan(7.5/12)=32.00538321 or about 32 degrees.
The arctan is the inverse of tan. To access it on the calculator press [2nd F][tan]
Depending on the calculator (sorry I do not have your model under my eyes)
Press [2nd F][tan] ( 7.5/12) [=]
7.5/12 = then [2nd F][tan] [ALPHA][Ans] [=]
Posted on Jan 21, 2012
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