Area and Circumference

Presentation

•

Mathematics

•

7th Grade

•

Hard

Joseph Anderson

FREE Resource

3 Slides • 9 Questions

Circles: Finding the Area & Circumference

Applying the formulas for circumference and area of a circle to semi-circles.

Parts of Circle (quick review)

Circle is a set of all points that are equidistant from another single point called the center.
r = radius d = diameter
Diameter: d = 2r or d = 2・r
Radius: r = $\frac{d}{2}$ or r = d ➗ 2

Multiple Choice

What is the diameter of this circle?

3.7 m

74 m

4 m

7.4 m

Multiple Choice

What is the radius of this circle?

13 ft

6.5 ft

26 ft

7.5 ft

Multiple Choice

If the the diameter of the large circle is 36 cm, what is the radius of each of the small circles?

12 cm

24 cm

18 cm

6 cm

Finding Circumference & Area

Circumference = π × Diameter or C =πD
or C=π2r or C=2πr
Area = π × radius x radius or $Area\ =\ \pi\ x\ r^2\ \ or\ \ A=\pi r^2$

Multiple Choice

I measured from the center of the wheel to the outside edge and it was 62.2 cm. What is the circumference of the wheel? Use 3.14 for pi.

62.2 cm

124.4 cm

195.303 cm

390.616 cm

Multiple Choice

I wrapped a tape measure around the trunk of the tree and it was 14.13 feet. What is the diameter of the tree? Use 3.14 for pi. Round to the nearest hundredth.

2.25 ft

44.37 ft

4.5 ft

17. 27 ft

Multiple Choice

What is the area of this semicircle if the diameter is 8 cm? Use 3.14 for pi.

25.12 sq cm

50.24 sq cm

200.96 sq cm

100.48 sq cm

Multiple Choice

What is the circumference of this semicircle if the diameter is 8 cm? Use 3.14 for pi.

25.12 cm

50.24 cm

20.56 cm

12.56 cm

Multiple Choice

A circular apple pie has an area of 706.5 cm². What is the radius of the pie? Use 3.14 for pi.

225 cm

15 cm

112.5 cm

30 cm

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Circles: Finding the Area & Circumference

Applying the formulas for circumference and area of a circle to semi-circles.

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