扇形の公式(面積・弧の長さ・弦の長さ)

三角関数

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\[ \sin \theta = \frac{b}{c} \ \ \ \ \ \cos \theta = \frac{a}{c} \ \ \ \ \ \tan \theta = \frac{b}{a} \] \[ b = c \cdotp \sin \theta\ \ \ \ \ a = c \cdotp \cos \theta \]

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EXCELの数式

	A	B
1	辺(c)	100
2	角度(θ)	60
3	辺(a)	=B1*COS(RADIANS(B2))
4	辺(b)	=B1*SIN(RADIANS(B2))
5	辺(c)	=SQRT(B1^2+B2^2)

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