Question

在三角形ABC中,已知a=2根号3,c=根号6+根号2,B等于45度,求边b？

Answer 1

²=a²+c²-2accosB
=(2√3)²+(√6+√2)²-4√3(√6+√2)√2/2
=12+8+4√3-12-4√3
=8
b=2√2,10,利用余弦定力，答案2根号2.,1,运用余弦定理：b^2=a^2+c^2-2accosB即
b²=(2√3)²+(√6+√2)²-4√3(√6+√2)√2/2
=12+8+4√3-12-4√3
=8
b=2根号2,0,