Surface Area and Circumference Lesson

4 Slides • 3 Questions

1

Working with Circumference & Area

2

Multiple Choice

What is the radius of the circle?

1

18

2

9

3

18 in.

4

9 in.

3

Multiple Choice

A circle has a radius of 3 cm. Find the area of the circle. Use 3.14 for pi.

1

28.26 $cm^2$

2

9.42 $cm^2$

3

18.84 $cm^2$

4

Learning Target

I can find the radius of a circle when given the circumference or area.

5

Find the Diameter

$C=2\pi r$
$43.96=2\pi r$
$43.96=\left(6.28\right)r$
$\frac{43.96}{6.28}=r$
r = 7 units
d = 14 units

6

Find the Radius

$A=\pi r^2$
$113.04=\pi r^2$
$\frac{113.04}{3.14}=r^2$
$36=r^2$
$6=r$

7

Multiple Choice

What is the diameter of a circle with a circumference of 47.1 cm?

1

12 units

2

15 units

3

7.5 units

Working with Circumference & Area

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