Question

A circular dinner plate has a radius of 20 centimeters. Find a. the circumference of the plate and b. the area of the plate. Use 3.14 for π.

Answer 1

➤ Answer

• Circumference of circular dinner plate = 125.6 cm.

• Area of circular dinner plate = 1256 cm²

➤ Given

• Radius of circular dinner plate = 20 centimeters.

• Value of π = 3.14.

➤ To Find

• Circumference and area of the circular dinner plate.

➤ Step By Step Explanation

Given that the radius of circular dinner plate = 20 centimeters. Value of π = 3.14.

We need to find the circumference and area of the plate.

So let's do it !!

Circumference ⤵

$\maltese\boxed{\underline{\bf{\pink{Circumference_{(Circle)} = 2\pi\: r}}}}$

➠ By substituting the values

$\longmapsto\tt 2 \times 3.14 \times 20 \: cm \\ \\ \longmapsto {\tt{\bold{125.6 \: cm}}}$

Area ⤵

$\maltese\boxed{ \underline{ \bf{\green{Area_{(Circle)} = \pi {r}^{2} }}}}$

➠ By substituting the values

$\longmapsto \tt3.14 \times {(20cm)}^{2} \\ \\ \longmapsto \tt3.14 \times 400{cm}^{2} \\ \\ \longmapsto {\tt{\bold{ 1256 \: {cm}^{2}}}}$

Therefore,

• Circumference of circular dinner plate = 125.6 cm.

• Area of circular dinner plate = 1256 cm²

__________________________