Question

The surface area of a cell phone screen is 9000 mm2. Use the fact that 10 mm = 1 cm to convert this area to cm2. Round your answer to the nearest whole number. Do not type the units in the space below.

Answer 1

9,000 mm² = 90 cm²

Explanation:

Given

A cell phone

Surface Area = 9,000mm²

10 mm = 1 cm

Required

Convert this area to cm²

From the question, we have that

`10 mm = 1 cm`

We start by taking square of both sides

`(10 mm)^2 = (1 cm)^2`

`(10 mm)(10 mm) = (1 cm)(1 cm)`

`100 mm^2 = 1 cm^2`

Then multiply both sided by 90

`90 * 100 mm^2 = 1 cm^2 * 90`

`9000 mm^2 = 90 cm^2`

At this point, we've been able to convert 9,000 mm² to cm² equivalent;

Hence, 9,000 mm² is equivalent to 90 cm²