Question

A rectangular solid has sides of 7 cm + 9 cm + 11 cm what
is its surface area

Answer 1

We have yhe formula 2 · ( 7·9 + 9·11 + 7·11 ) = 2 · ( 63 + 99 + 77 ) = 2 · 239 = 478 cm^2;

Explanation: