Question

Find the value of x in the triangle shown below

Answer 1

The answer is A - use Pythagoras’ Theorem (a squared + b squared = c squared)

If a is 7cm, then a squared is 49cm
If b is 4cm, then b squared is 16cm

c squared is 49cm + 16cm = 65cm
So, c is the square root of 65cm

Answer 2

A again.

Explanation:

This is because

`7^(2) +4^(2) =x^(2) \\ 49+16 = x^(2) \\ 65 = x^(2) \\ √(65) = x`