Calvin, this is a right triangle:
Leg1 = x
Leg 2 = x
Hypotenuse = 18
Using Pythagorean Theorem, we have:
18 = √(x² + x²)
18 = √2x²
18 = x √2
x = 18/√2
x = You can calculate the value dividing 18 by √2, Calvin
