Question

Find the diameter of a circle that has an area of 42 cm2. Use 3.14 for pi and round to the nearest tenth of a centimeter. 07.3 cm. 3.7 cm. 26.8 cm 13.4 cm.

Answer 1

7.3 cm

Step-by-step explanation:

The area, A of a circle of radius r is defined below:

`A=\pi r^2`

Given that: A=42, π=3.14, then:

`\begin{gathered} 42=3.14* r^2 \\ r^2=(42)/(3.14) \\ r^2=13.38 \\ r=\sqrt[]{13.38} \end{gathered}`

Next, determine the diameter.

The diameter of the circle is 7.3cm (to the nearest tenth of a centimeter.).