1) To find

we are going to use the Pythagorean equation:

where

and

are the legs of our triangle. For our picture we can infer that

and

, so lets replace those values in our equation to find

:




We can conclude that the value of

in our triangle is
12.82) To find

we are going to use the trigonometric function tangent. Remember that

. We know that the opposite side of our angle

is 8, and its adjacent side is 10, so lets replace those values in our tangent function to find

:


Since we need the measure of angle

, we are going to take inverse tangent to both sides to find it:


We can conclude that the value of

in our triangle is
38.66°3) Finally, to find

we are going to take advantage of two facts: the sum of the interior angles of a triangle is always 180°, and our triangle is a right one, so one of its sides is 90°. Therefore,

. Since we already know the value of

, lets replace it in our equation and solve for

:



We can conclude that the measure of angle

is
51.34°<span />