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Back to Exercise: Know the formulas for the area and circumference of a circle and use them to solve problems

Area and Circumference of Circles

Show your work. For exact answers, leave in terms of π. For approximate answers, use π ≈ 3.14 unless told otherwise.

Grade 7·21 problems·~45 min·Common Core Math - Grade 7·standard·7-g-b-4
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A

Recall / Warm-Up

A circle with center O and a horizontal diameter labeled 14 cm.
1.

The diagram shows a circle with center O. The full width of the circle (the diameter) is labeled 14 cm. What is the radius of this circle?

2.

Evaluate 929^2.

3.

Which value is the best approximation for π (pi)?

B

Fluency Practice

1.

A circle has a radius of 7 cm. Find its exact circumference. Leave your answer in terms of π.

2.

A circle has a diameter of 20 m. Find its approximate circumference. Use π ≈ 3.14.

3.

A circle has a radius of 5 cm. Find its exact area. Leave your answer in terms of π.

4.

A circle has a diameter of 12 ft. Find its exact area. Leave your answer in terms of π.

5.

A circle has a radius of 10 m. Which of the following correctly gives its circumference?

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