A circle has radius 50 cm. Which of these is closest to its area?
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1
Question 2
2.
The shape is composed of three squares and two semicircles. Select all the expressions that correctly calculate the perimeter of the shape.
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1
Question 3
3.
Select all of the true statements.
1 point
1
Question 4
4.
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? Explain or show your reasoning.
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1
Question 5
5.
A class measured the radius and circumference of various circular objects. The results are plotted on the graph. Why might the measured radii and circumferences not be exactly proportional?
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1
Question 6
6.
For each quantity, decide whether circumference or area would be needed to calculate it. Explain or show your reasoning.
The distance around a circular track.
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1
Question 7
7.
For each quantity, decide whether circumference or area would be needed to calculate it. Explain or show your reasoning.
The total number of equally-sized tiles on a circular floor.
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1
Question 8
8.
For each quantity, decide whether circumference or area would be needed to calculate it. Explain or show your reasoning.
The amount of oil it takes to cover the bottom of a frying pan.
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1
Question 9
9.
For each quantity, decide whether circumference or area would be needed to calculate it. Explain or show your reasoning.
The distance your car will go with one turn of the wheels.
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1
Question 10
10.
This figure is made from a part of a square and a part of a circle. What is the perimeter of this figure, to the nearest unit?
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1
Question 11
11.
This figure is made from a part of a square and a part of a circle. What is the area of this figure, to the nearest square unit?
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Question 12
12.
A groundskeeper needs grass seed to cover a circular field, 290 feet in diameter. A store sells 50-pound bags of grass seed. One pound of grass seed covers about 400 square feet of field. What is the smallest number of bags the groundskeeper must buy to cover the circular field? Explain or show your reasoning
1 point
1
Question 13
13.
Sam's bicycle has a radius of 35 cm. What is the circumference of the tire? (Use 3.14 for pi)