Quiz about Math 7 Unit 3 Circles

Question 1

A circle has radius 50 cm. Which of these is closest to its area?

Accepted Answer

7,854 cm2

Answer

157 cm2

Answer

314 cm2

Answer

15,708 cm²

Question 2

Select all the expressions that correctly calculate the perimeter of the shape.

Accepted Answer

$$40+20\pi$$

Accepted Answer

$$10+10+10\pi+10+10+10\pi$$

Answer

$$80+20\pi$$

Answer

$$120+20\pi$$

Answer

$$300+100\pi$$

Question 3

$$\pi$$ is the area of a circle of radius 1.

Accepted Answer

True

Answer

False

Question 4

$$\pi$$ is the area of a circle of diameter 1.

Accepted Answer

False

Answer

True

Question 5

$$\pi$$ is the circumference of a circle of radius 1.

Accepted Answer

False

Answer

True

Question 6

$$\pi$$ is the circumference of a circle of diameter 1.

Accepted Answer

True

Answer

False

Question 7

$$\pi$$ is the constant of proportionality relating the diameter of a circle to its circumference.

Accepted Answer

True

Answer

False

Question 8

$$\pi$$ is the constant of proportionality relating the radius of a circle to its area.

Accepted Answer

False

Answer

True

Question 9

A class measured the radius and circumference of various circular objects. The results are plotted on the graph. Does there appear to be a proportional relationship between the radius and circumference of a circle?

Accepted Answer

Yes

Answer

No

Question 10

Decide whether circumference or area would be needed to calculate the distance around a circular track.

Accepted Answer

Circumference

Answer

Area

Question 11

Decide whether circumference or area would be needed to calculate the total number of equally-sized tiles on a circular floor.

Accepted Answer

Area

Answer

Circumference

Question 12

Decide whether circumference or area would be needed to calculate the amount of oil it takes to cover the bottom of a frying pan.

Accepted Answer

Area

Answer

Circumference

Question 13

Decide whether circumference or area would be needed to calculate the distance your car will go with one turn of the wheels.

Accepted Answer

Circumference

Answer

Area

Math 7 Unit 3 Circles

18 questions

A circle has radius 50 cm. Which of these is closest to its area?

Select all the expressions that correctly calculate the perimeter of the shape.

A class measured the radius and circumference of various circular objects. The results are plotted on the graph. Does there appear to be a proportional relationship between the radius and circumference of a circle?

Why might the measured radii and circumferences not be exactly proportional?

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