What is the area of a circle with radius r?

Mathematics For Machine Technology
8th Edition
ISBN:9781337798310
Author:Peterson, John.
Publisher:Peterson, John.
Chapter19: Achievement Review—section One
Section: Chapter Questions
Problem 30AR: A plate 57.20 millimeters thick is to be machined to a thickness of 44.10 millimeters. The plate is...
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What is the area of a circle with radius r?

Use r for radius, pi for π. Use * for multiplication and / for division and collect terms using (). Use ^ for exponent, i.e. for xn write x^n.
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