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Circles Review 7th Grade
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What is the formula for area of a circle?
Area = pi x (radius squared)
What is the formula for circumference of a circle?
Circumference = pi x diameter
If the length of segment AB is 21 units, what is the length of segment OC?
10.5
Find the area of the combined figure.
220.24 square cm
Find the perimeter of the figure.
35.42 units
Find the area of a circle whose circumference is 34.54 inches. DO NOT ROUND YOUR ANSWER.
94.985 square inches
Find the area of a circle whose circumference is 15.7 feet. DO NOT ROUND YOUR ANSWER.
19.625 square feet
Mrs. Miller ordered a pizza with a 10 inch diameter. Mrs. McCheynne ordered a pizza with a 12 inch diameter. What is the difference in area of the two pizzas?
34.54 square inches
What is the diameter of a circle whose circumference is 13.188 inches?
4.2 inches
Mrs. Rowe is pushing her toddler in a stroller around a lake. The lake is a circle with a diameter of 1.5 miles. How far does Mrs. Rowe walk if she walked all the way around the lake?
4.71 miles
Does this situation describe circumference or area? "the total number of equally sized tiles on a circular floor"
area
Does this situation describe circumference or area? "the distance a bike will go with one turn of the wheel"
circumference
What mathematical term do we used to describe segment RO?
radius
A farmer has a circular shaped field. Fertilizer costs $0.27 per square yard. How much will the farmer spend to fertilize the field? The diameter of the field is 130 yards.
$3,581.96
What is the area of a circle with a diameter of 46 miles?
1,661.06 sq. miles
Find the circumference of a circle with a radius of 9.5 inches.
59.66 inches
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