Question

Please help me, I'm trying to find total surface area!

Answer 1

Find the total surface area of the solid.


The faces of this solid are

1 rectangle  8 cm × 20 cm;

1 rectangle  17 cm × 20 cm;

1 rectangle  15 cm × 20 cm;

2 triangular bases (right triangles). The area of each one is

(8 cm × 15 cm)/2.


Total surface area:

A = 8 × 20 + 17 × 20 + 15 × 20 + 2 × [ (8 × 15)/2 ]

A = 160 + 340 + 300 + 120

A = 920 cm^2   <———    this is the answer.


I hope this helps. =)