Question

Can you help me please my peanut brain cant do it

Answer 1

diagonal = 13 cm

Explanation:

the length of the space diagonal (d) is calculated as

d =
`√(length^2+width^2+height^2)`

here length = 4 cm , width = 3 cm , height = 12 cm , then

d =
`√(4^2+3^2+12^2)` =
`√(16+9+144)` =
`√(169)` = 13 cm