Question

A rectangular solid has sides of 7 cm, 9 cm, and 11 cm. What is its surface area?

Answer 1

Surface area is, 478 square centimeter

Explanation:

Surface area (S)of rectangle is given by:

`S = 2(lw+wh+hl)` .....[1]

where,

l is the length

w is the width

h is the height of the rectangle respectively.

As per the statement:

A rectangular solid has sides of 7 cm, 9 cm, and 11 cm

⇒ l = 7 cm , w = 9 cm and h = 11 cm

Substitute in [1] we have;

`S = 2(7 \cdot 9+9 \cdot 11+11 \cdot 7)`

⇒
`S = 2(63+99+77) = 2 \cdot 239 = 478 cm^2`

Therefore, the surface area is, 478 square centimeter