Circumference and area of circles

Circumference and Area of Circles

Multiple Choice

A line that goes from one end of the circle to the other and crosses the center point.  

• center

• diameter

• dime eater

• radius

Draw

Draw a circle with a diameter of 10cm.

Audio Response

Record what goes in the blank. The diameter of this circle is ________.

Open Audio Recorder

Fill in the Blanks

Multiple Choice

12 inches in this circle represents its

• radius

• diameter

Drag and Drop

The radius of a circle is ​​​

Placeholder

the diameter.

Drag these tiles and drop them in the correct blank above

half

twice

triple

Draw

Draw a circle with a radius of 4 cm.

Multiple Choice

What is the formula for Circumference?

• C = πr²

• C = πd

• C = πr

Multiple Choice

Find the circumference of the circle whose diameter is 10 m

• 31.4 m

• 62.8 m

• 15.7 m

Multiple Choice

Find the circumference of the circle whose radius is 4 in

• 12.56 in

• 25.12 in

• 50.24 in

Multiple Choice

What is the circumference of this circle ?

• 3.14 cm 

• 37.68 cm

• 24 cm

• 68.4 cm

Multiple Choice

$$4^2=$$  

• $$4\times4$$  

• $$4-4$$  

• $$4\div4$$  

• $$4+4$$  

Multiple Choice

Find the Area using this formula: $$A=\pi r^2$$  

• $$18.84\ in^2$$

• $$113.04\ in^2$$

• $$37.68\ in^2$$

• $$59.16\ in^2$$

Multiple Choice

What is the area of this circle?

• 1384.74

• 2142.12

• 5541.77

• 1289.12

Math Response

What is the AREA of this circle?

Type answer here

Correct Answer: 153.86

Deg^°

Rad

Multiple Choice

When finding area of a circle, if diameter is given, we need to find radius. We can find radius by ___________ diameter by 2.

• Adding

• Subtracting

• Multiplying

• Dividing

Match

Match the formulas to the measurements indicated.

• To find the area of a circle use:

• To find the circumference of a circle use:

• To find the diameter of a circle use:

• To find the radius of the circle use:

A=

C=

2r

d/2

• A= $$\pi r^2$$

• C= $$\pi d$$

• 2r

• d/2

Multiple Choice

A cruise ship has a large, circular window. It has a diameter of 6 meters. What is the window's area?

• 31.25 m²

• 29.55 m²

• 30.36 m²

• 28.26 m²

Multiple Choice

Find the area of a circle with a diameter of 6 inches.

• $$18.84in^2$$

• $$18.48in^2$$

• $$28.62in^2$$

• $$28.26in^2$$

Multiple Choice

Charlotte's dining room table is round and has a radius of 4.5 feet. What is the tabletop's area?

• 63.585 ft²

• 68.345 ft²

• 64.585 ft²

• 61.345 ft²