Explanation:
Since it has a hypotenuse, it is a right triangle
use pythagorean theorem to find the other leg
10 ^2 = x ^2 + 5 ^2
x = sqrt (75)
Triangle Area = 1/2 base * height
or area = 1/2 * leg1 * leg2
= 1/2 * 5 * sqrt 75 = 21.7 units ^2
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