Objectives: SWBAT find the circumference of circles SWBAT solve problems involving circumference of circles.

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SPI: Calculate with circumferences and areas of circles.

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Objectives: SWBAT find the circumference of circles SWBAT solve problems involving circumference of circles

circle center radius diameter chord circumference  (pi)

Find the Circumference of a Circle Find the circumference of the circle. Round to the nearest tenth. C=  dCircumference of a circle =  ● 12Replace d with 12. =12  Simplify. This is the exact circumference. Answer: The circumference is about 37.7 inches. To estimate the circumference, use a calculator. ENTER×2nd 12[  ]

A.12 ft B.12.6 ft C.25.1 ft D.50.3 ft Find the circumference of the circle to the nearest tenth.

Find the Circumference of a Circle Find the circumference of the circle. Round to the nearest tenth. Answer: The circumference is about 44.6 meters. C=2  rCircumference of a circle =2 ●  ● 7.1Replace r with 7.1.  44.6Simplify. Use a calculator.

A.A B.B C.C D.D A.5.0 cm B.8.0 cm C.10.1 cm D.32.2 cm Find the circumference of the circle to the nearest tenth.