Question

Anyone know the answer

Answer 1

Yeah... so
Pythagoras theorem

`{a}^(2) = {b}^(2) + {c}^(2)`
In your case

`{b}^(2) = {8}^(2) + {16}^(2) \\ √(b)`
So the answer is 64

Answer 2

8x16x2=64 So the answer is 64