Circle information
Circumference
Area
Circle graphs
Others
100

What would you use from your protractor kit to make a circle?

Compass

100

What does circumference mean?

the distance around a circle (like perimeter of square)

100

What is the equation for the area of a circle?

A = pi x r x r

100

What is square root of 121?

11

100

what is the area of a circle with a 2.4 cm radius? (to the nearest tenth)

A=3.14x 2.4 x2.4 A=18.1cm^2

200

What is (distance around) divided by (diameter)? 

Pi

200

What is the equation for circumference? (both equations)

c=pi x d or c= pi x 2 x r

200

If you have a circular mirror with a radius of 20cm, what is its area?

A= π x 20x 20cm A = 400π cm2

200

If C = 14pi, how long is the radius?

7 units

200

true or false: If the radius of a circle is doubled, then the circumference is also doubled?

Always true

300

What is (distance around) divided by (radius)? 

2pi

300
What is the circumference of a circle if it has a diameter of 5.2 m?
answer: 16.33 m c=3.14 x 5.2 c= 16.33 m
300

A circle has a diameter of 25cm. What is it's area?(2 decimal places)

r=12.5cm 

A=π x 12.5 x 12.5 

= 490.63cm2

300

The diameter of a circle is 12meters. What is circle's area?

36 m2

300
When drawing a circle graph, what tools should you use: 1) to measure each section? 2) to draw the circle? 3) to find the radius or diameter?
1) to measure the sections you use a protractor 2) to draw the circle you need a compass 3) to find the radius or diameter you need a ruler
400

What are the equations for finding the radius and diameter?

radius= d ÷ 2 diameter =r x 2

400

If you are given a radius of 6cm, what is the circumference?

12π cm

400

The area of a circle is about how many times the square of its radius? a.1 b.2 c.3 d.4

answer: 3

400

The area of a circle is 25pi km2. What is the circle's circumference?

10pi km

400
The measure of space covered by a 2-D shape is the definition for what? And Find this if you have a radius of 5cm.
area =78.5 cm^2
500

What is the radius of a circle with a diameter of 95m? (leave your answer in cm)

4750 cm

500

What is the diameter of a circle that has a circumference of 221mm? (round to nearest hundredth)

c= π x d 221mm = 3.14 x d 221/3.14 =d d=70.38mm

500

Fourty-four metres of fencing is used to make a circular enclosure. What is the area of the circle? (to the nearest square metre)

44 is the circumference 

44=3.14 x d 14.01= d r=7.01 A= π x r x r A= 3.14 x 7.01 x 7.01 A=154 m2

500

You want to fi nd the distance the monster truck travels when the tires make one 360-degree rotation. What best describes this distance?

circumference

500
The outer ring of the Canadian toonie has an outside diameter of 28mm and an inside diameter of 8mm. What is the area of the outer ring to the nearest hundredth of a square millimeter?
414.48mm^2
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