Casio50 » fx-50F » Built-in Formulae & Physical Constants 內置程式及物理常數

Cosine Theorem
餘弦定理

此式可在已知三角形兩邊及其夾角的情況下找出餘下的邊長.

操作方法

一般操作 例子
A Triangle with side b and c and an included angle theta known. Find side a.
已知 b, c 及 θ 的值, 求 a.		 In a triangle, two sides are known with length 15 cm and 9.5 cm respectly. The included angle is 62.3 degrees. Find the length of the remaining side.
求未知的邊長.
啟動方程式
2 FMLA 		2 FMLA
輸入數據
b RUN
c RUN
θ RUN 		[b?] 15 RUN
[c?] 9.5 RUN
[θ?] 62.3 RUN
顯示餘下邊長
a		 [a=] 13.51924617

記憶體

K1 b
K2 c
K3 θ
K4 a
K5  
K6
M

公式

a = sqrt(b^2 + c^2 - 2bc cos theta)

相關程式

  1. Heron’s Formula / 三邊求三角形面積
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