Question

I need help plz I don’t get This

Answer 1

Find the area: you can split the figure into two rectangles.

The rectangles will be 7*20 and 7*11. The areas of those are 140 cm² and 77 cm². Add those up, and you get 217 cm².

Find the surface area: you can also split the net (the figure's surface area represented in a two-dimensional form) into two congruent triangles and three congruent rectangles. the triangles' area is 2(1/2*10*8) = 80 cm². The rectangles' area is 3(18*8) = 432 cm². Those totaled is 512 cm².