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8-96.
  1. Use what you know about the area and circumference of circles to answer the questions below. Show all work. Leave answers in terms of π. Homework Help ✎

    1. If the radius of a circle is 14 units, what is its circumference? What is its area?

    2. If a circle has diameter 10 units, what is its circumference? What is its area?

    3. If a circle has circumference 100π units, what is its area?

    4. If a circle has circumference C, what is its area in terms of C?

To calculate the area of a circle use πr2, for the circumference use 2πr.

area = 196π
circumference = 28π

Use the formulas given in part (a). What is the radius of this circle?

100π = 2πr
Solve for the radius then use the radius to calculate the area.