曲線 f(x) 上の点A ( t,α ) 、B ( t + δ , β ) に於いて直線ABの傾きは、 a= f(t+δ) - f(t) / t + δ - t f(x)= x2 に於いて a= ( t+δ ) 2 - t2/ δ = 2t + δ2 δ= 0 なので a=2t T.theodor
circumference = 4r√π T.theodor
= 2.718281782 T.theodor
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