Question

Find x.

A. 4
B. 4 times the square root of 2
C. 8
D. 4 times the square root of 3

Answer 1

B

Answer 2

You really ought to learn the special right triangles. You are going to need them many times.

Answer 3

This is a 45-45-90 right triangle. So you know both legs are the same length. You also know if a leg is x, then the hypotenuse is x sqrt(2)
In this case, the leg is length 4, so the longest side has length 4 sqrt(2)

You could also have used the pythagorean thm to find the answer. Do you try on any of these??