two sides of a triangle have lengths 28.2cm and 18.8cm,the angle between them is 41.5,find the len
题目
two sides of a triangle have lengths 28.2cm and 18.8cm,the angle between them is 41.5,find the len
two sides of a triangle have lengths 28.2cm and 18.8cm,the angle between them is 41.5,find the lengths of the sides of an isosceles triangle with the same area,
答案
有两边一角可以求出第一个三角形面积
sin41.5 * 28.2 * 18.8/2
有了面积,求等面积等边三角形边长
无解...确定不是正三角形?
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