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**Area and Circumference of Circles**

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**= + + + Area and Circumference of Circles**

Circumference (C) - distance around a circle (similar to perimeter) If you measure the circumference and divide it by the diameter, the answer will always equal or Diameter Diameter + Diameter + Diameter = + Circumference 3.14 diameters equal circumference

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**Formula for circumference: C = d or C = 2 r**

Find the circumference of each circle using the formula. Calculator permitted. Show required steps. Use 3.14 for . 1.) 5.1 m 2.) 8 cm

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**4.) Formula for circumference: C = d or C = 2 r 3.)**

Find the circumference of each circle using the formula. Show required steps. Leave your answer in terms of . 14 cm 3.) 4.) 35 m

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**Area A= r2 π≈3.14 A = A = A = 3 m How many square units**

are in the circle? Use 3.14 for pi. Required Steps
(Calculator permitted) A = 3 m A = A =

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**5 m 2.) 7 m Find the area of each circle. Show all required steps.**

1.) (use 3.14 for pi) 2.) (write your answer in terms of ) 5 m 7 m

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**Find the area of each circle when the diameter **

is given. First find the radius, then show required steps. 3.)(use 3.14 for pi) 4.) d = 9 ft. 12 m (write your answer in terms of )

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**Circles and Irregular Figures**

Find the area of the shaded region. 1.) 2.) 14 ft 20 ft (use 3.14 for pi) 16 m

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**Finding the radius or diameter given the area**

1.) The circular floor of the Pantheon in Rome has an area
of about 1473 square meters. What is the diameter of
the floor to the nearest tenth of a meter? 2.) The area of a circle is 615 cm2, what is the radius (round your answer to the nearest whole number)?

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**. 1.) 2.) Demonstrate Understanding 8 m 11 cm**

Find the area and circumference for each. Use 3.14 for 1.) 2.) 11 cm 8 m 15 mm . 15 mm 3.) The area of a circle is 254 m2, what is the radius?

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