Answer:
#11 is an isosceles triangle which means 2 sides are the same. If they give you the hypotenuse, then I'm assuming the 2 same sides are unknown.
Using the Pythagorean Theorem, a^2+b^2=c^2, then you get:
a²+b²=8²
a²+b²=64
Which means a² and b² must be 32 each because they are the same. Find the sqrt of 32 for the smaller legs.
