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Circle information
Circumference
Area
Benchmark Test
Others
100

What is the diameter?

The full length of the circle

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

A = pi x r2

100

The total amount of tomatores a tomato plant produces, t, in s seasons can be represented by the equation t = 55s . What is the constant of proportionality in the equation?

55

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 A= 1256.63 or 1256

200

An artist created a scale drawing of a mural with the a length of 9 in and a width of 7.2 inches. The artist used a scale of 1 inch = 2.5 feet. What are the actual width and length of the mural? What is the area?

22.5 feet and 18 feet

A = L x W 

A= 22.5 x 18 = 405 feet squared

200

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

Always true

300

What is the radius?

Half of the diameter

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

What is a proportional relationship?

When the values in x are each multiplied by the same number to get the values in y.


Equivalent Ratios

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

What is the Constant of Proportionality?

x   y

2   10

3   15

5   25

10 50

The constant of proportionality is 5 

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

25 is what percentage of 100?

25%

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