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Back to 8.9 Use Direct and Inverse Variation

8.9 Exercise 15

Avg difficulty 2.5

The area of a circle varies directly as the square of the radius. A circular pizza with a radius of 6 inches has an area of 113.04 square inches.

  1. ⓐ Write the equation that relates the area to the radius.
  2. ⓑ What is the area of a pizza with a radius of 9 inches?

OpenStax Elementary Algebra 2e, 8.9 Use Direct and Inverse Variation, exercise 15

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Adapted from Elementary Algebra 2e © 2020 Rice University. Licensed under CC BY 4.0. Source: Elementary Algebra 2e. Imported at revision 77a933c.