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Home > CC2 > Chapter 9 > Lesson 9.1.2 > Problem 9-32

9-32.

Find the area and circumference of the circles in parts (a) and (b) and the radius in part (c). You may want to refer to the Math Notes box in this lesson.  

  1. A circle with a horizontal line segment, from left to right edges, through the center, labeled 15 m.


    What measurement is given in the diagram?

    To find the circumference, substitute the diameter into the equation.To find the area, you must find the radius from the diameter.

    Remember that the diameter is times the radius.


    m2
    m

  1. A circle with a horizontal line segment, from the center to right edge, labeled 9 inches.

    See part (a).

  1. A circle with the label, C, = 314 cm.

    In this equation, you are given the circumference. With this, you must find the radius in order to find the area.

    Since