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8-96.

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

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

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

    area
    circumference

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

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

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

      Solve for the radius then use the radius to calculate the area.

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