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Home > CC2 > Chapter 9 > Lesson 9.2.4 > Problem 9-90

9-90.

Find the area and circumference of a circle that has a diameter of 17 mm. Write your answers in terms of π and as a decimal approximation. Homework Help ✎

Use the formulas for the area and circumference of a circle:

Area: π • r 2

Circumference: π · 2r or π · d

Area = π (8.5)2 = 72.25π ≈ 226.98 mm2