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Home > MC2 > Chapter 5 > Lesson 5.3.4 > Problem 5-125

5-125.

Recall the equation for area from the Math Notes box of Lesson 5.3.4.

A = r2 π

What measurement is missing in this equation?

Diameter = 2 (radius)

Solve for r.

Substitute the newly calculated radius into the area formula.

20 = 2 r

A = (10)2 π

314 cm2