Question

Find the surface area of the composite solid. Write your answer as a decimal.

Answer 1

283.5 cm²

Explanation:

Base triangle + 3 rectangles + 3 top triangles

(½×8.7×10) + 3(10×6) + 3(½×4×10)

43.5 + 180 + 60

283.5

Answer 2

`283.5 {cm}^(2)`

Explanation:

`( (1)/(2) * 8.7 * 10) + 3(10 * 6) + 3( (1)/(2) * 4 * 10) \\ 43.5 + 180 + 60 \\ = 283.5 {cm}^(2)`