11. One circle has a radius of 98 cm and a second concentric circle has a radius of 1 m 26 cm . How much longer is the circumference of the second circle than that of lirst? 12. Find the distance covered by the wheel of a bus in 2000 rotations if the diameter of the wheel is 98 cm . [Hots] 212 Perimeter and Area
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1 m 26 cm = 100 cm + 26 cm = 126 cm Show more…
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Express your answers to problems in this section to the correct number of significant figures and proper units. What is the area of a circle $3.102 \mathrm{cm}$ in diameter?
For each problem, decide whether the circumference of the circle or the area of the circle is most useful for finding a solution. Explain your reasoning. a. A car's wheels spin at 1000 revolutions per minute. The diameter of the wheels is 23 inches. You want to know how fast the car is travelling. b. A circular kitchen table has a diameter of 60 inches. You want to know how much fabric is needed to cover the table top. c. A circular puzzle is 20 inches in diameter. All of the pieces are about the same size. You want to know about how many pieces there are in the puzzle. d. You want to know about how long it takes to walk around a circular pond.
Measuring Circles
Distinguishing Circumference and Area
The circumference, in cm, of a circle whose radius is r cm is given by C = 2πr. Evaluate and interpret the following: 1. The radius of a circle with circumference 14π. 2. The circumference of a circle with radius 14π.
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