Plane Geometry - Bruce E. Shapiro

Plane Geometry - Bruce E. Shapiro Plane Geometry - Bruce E. Shapiro

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234 SECTION 42. AREA AND CIRCUMFERENCE OF CIRCLESProof. This follows by substituting the C = 2πr from the definition of π inthe Archimedes’ formula,A = 1 2 rC = 1 r(2πr) = πr22« CC BY-NC-ND 3.0. Revised: 18 Nov 2012

SECTION 42. AREA AND CIRCUMFERENCE OF CIRCLES 235Revised: 18 Nov 2012 « CC BY-NC-ND 3.0.

SECTION 42. AREA AND CIRCUMFERENCE OF CIRCLES 235Revised: 18 Nov 2012 « CC BY-NC-ND 3.0.

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