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Plane Geometry - Bruce E. Shapiro

Plane Geometry - Bruce E. Shapiro

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Section 42Area and Circumferenceof Circles in Euclidean<strong>Geometry</strong>Definition 42.1 The perimeter L of polygon P 1 P 2 · · · P n isP = P 1 P 2 + P 2 P 3 + · · · + P n−1 P n + P n P 1We can inscribe a regular hexagon within within circle as follows:1. Choose any point on P 1 ∈ Γ = C(O, r).2. Define a ray r = −−→ OP 1 .3. On one side of r we can define a points P 2 ∈ Γ such thath µ(∠P 1 OP 2 ) =60.4. On the opposite side of −−→ OP 2 from P 1 determine a a point P 3 on Γsuch that ∠P 1 OP 2 = 60.5. Continue to determine points P 4 , P 5 , P 6 in the same manner, so thatP 3 OP 4 = P 4 0P 5 = P 5 OP 6 = 60.6. Then P 1 P 2 P 3 P 4 P 5 P 6 is a regular hexagon.Each △P i OP i+1 (including P 6 OP 1 ) constructed in this manner is a congruentequilateral triangle.229

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