Given: 
as shown in the drawing 
Find: 

(HINT:  Compare this drawing to the one for Exercise 20.) 
To find:
Approach:
For a right triangle for which the measure of the interior angles
Length of the other leg
Length of the hypotenuse
In general
Length of the legs are equal.
Length of the hypotenuse
Calculation:
Given,
In
Also,
Now, draw a perpendicular
Thus,
Here,
Now, consider the triangle
Thus, in
In a right triangle whose angle measure
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