Question

Does anyone know the answer and how to get the answer ?

Answer 1

3.
`384\ square\ inches`

Explanation:

To solve this, find the areas of the smaller geometric shapes and add them together.

1. Rectangle (top)

`A_1 = lw = 20 * 5 = 100`

2. Rectangle (middle)

`A_2 = lw = 20 * 8 = 160`

3. Rectangle (bottom)

`A_3 = lw = 20 * 5 = 100`

4. Triangle (left)

`A_4 = (bh)/(2) = (8*3)/(2) = (24)/(2) = 12`

4. Triangle (right)

`A_5 = (bh)/(2) = (8*3)/(2) = (24)/(2) = 12`

Add the areas together for the total surface area.

`A_t = 100 + 160 + 100 + 12 + 12 = 384`