Question

Can someone tell me how to do this step by step please

Answer 1

Explanation:

Pythagoras

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

Plugging in numbers

`{4}^(2) + {8}^(2) = {c}^(2)`

If we do the math given

`16 + 64 = {c}^(2) - - - 80 = {c}^(2)`

Last but not least, we root both sides

`√(80) = c`

Which means C = 8.9