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Circle Area Challenge

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Circle Area Challenge

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Test your circle area knowledge

Created by

Tyler
Tyler
United States

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Circle Area Challenge
 

Circle Area ChallengeOnline version

Test your circle area knowledge

by Tyler
1

What is the standard formula for the area of a circle with radius r?

2

Circle with radius 3 has area of…

3

A circle with diameter 10 has area of…

4

Which formula uses diameter directly for area?

5

If radius is 0, the area is…

6

What is the approximate value of π used in area calculations?

7

Circle with radius 7 has area equal to…

8

Which is NOT a correct formula for circle area?

9

If radius doubles from r to 2r, the new area is…

10

If r = 5, the area is…

Feedback

The area depends on the radius squared, A = π r^2.

Area = π × 3^2 = 9π.

Radius is diameter/2 = 5, so A = π(5)^2 = 25π.

Since r = d/2, A = π(d/2)^2 = (π/4)d^2.

Any circle with r = 0 has no area.

π is approximately 3.1416.

A = π × 7^2 = 49π.

A = πr^2 is correct; others are not valid area formulas.

A scales with r^2, so doubling r multiplies area by 4.

A = π × 5^2 = 25π.

 
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