Finding the area of circles

Presentation

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Mathematics

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7th Grade

•

Practice Problem

•

Medium

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CCSS

7.G.B.4, HSG.GMD.A.1

Standards-aligned

JUSTIN COTTON

Used 63+ times

FREE Resource

5 Slides • 9 Questions

Finding the area of circles

Multiple Choice

What number is the approximation of pi?

3.14

Multiple Choice

Which equation could be used to find the area of a circle?

A=\pi r^2

$A\ =\ \pi d$

$A\ =\ \pi^2$

Write down the area formula in your notebook or wherever you take your notes.

Multiple Choice

Find the area of the circle

56.52

254.34

1017.36

113.04

Multiple Choice

What is the area of this circle?

6082.12

1519.76

1893.14

1292.92

Multiple Choice

What is the area of this circle?

82.13

78.5

314.16

170.12

For the next couple questions remember that diameter = 1/2 the radius.

So you have to divide the diameter by 2 before you apply the formula for the area of a circle.

Multiple Choice

What is the area of this circle?

8322.13 cm²

1133.54 cm²

4536.46 cm²

1267.09 cm²

Multiple Choice

A clock face has a diameter of 10 inches. What is the approximate area of the clock face in square inches?

314 in²

31.4 in²

7.85 in²

78.5 in²

Multiple Choice

What is the area of this circle?

163.2

15.3

124.2

113.1

When finding the area of a part of a circle we multiply by the fraction of the circle

Multiple Choice

Mrs. Wilson placed the welcome mat shown below on her front door step. What is the area of her welcome mat in square feet? Leave in terms of π.

A = 2π

A = 8π

A = 10π

A = 4π

Finding the area of circles

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