Review Area of Circles

Presentation

•

Mathematics

•

10th Grade

•

Hard

Joseph Anderson

FREE Resource

3 Slides • 9 Questions

Circumference and Area of Circles Review

I can use the formulas for circumference and area of circles and semi-circles.

Parts of a Circle

Circle: a set of all points that are equidistant from another single point called the center.
r = radius ; D = diameter
Diameter = 2 x radius or D = 2r
radius=Diamater/2 or r=D/2
Watch the video https://www.youtube.com/watch?v=cC0fZ_lkFpQ

Multiple Choice

Determine the radius of the penny

59.66 mm

9.5 mm

38 mm

119.32 mm

Multiple Choice

Is the red line a radius or diameter of the circle?

Radius

Diameter

Circumference and Area

Circumference = π ×Diameter
C =πD
Since D=2xr then C=2πr

Area =π ×radius ×radius
or A=π x r^2
A=π x r2

Multiple Choice

Jayne has a very large circular lollipop that has a circumference of 25.12 inches. What would the diameter of Jayne’s lollipop be? Use π = 3.14.

4 in.

8 in.

12 in.

16 in.

Multiple Choice

What is the area of this circle?

8322.13

1134.11

4536.46

1267.09

Multiple Choice

What does area mean?

the distance around a shape

half the distance around a shape

the amount of space outside a shape

the amount of space inside a shape

Multiple Choice

What is the formula for finding the area of a circle?

Multiple Choice

The image shows two circles. The diameter of Circle A measures 5 cm, and it is the same as the radius of Circle B. What is the diameter of Circle B?

5 cm

25 cm

10 cm

12.5 cm

Multiple Select

Select all of the formulas below that can be used to find the circumference of a circle.

πd

πr²

πdr

2rπd

2πr

Multiple Select

Select all of the formulas below that can be used to find the circumference of a circle.

πd

πr²

πdr

2rπd

2πr

Circumference and Area of Circles Review

I can use the formulas for circumference and area of circles and semi-circles.

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