已知A=45° B=30° c=10则b等于多少?

Question

已知A=45° B=30° c=10则b等于多少?

Answer 1

这里要使用三角形的正弦定理
A=45°,B=30°
sinC/c=sinB/b
b=csinB/sinC
sinB=1/2
sinC=sin(180-A-B)
=sin(A+B)
=sinAcosB+sinBcosA
=√6/4+√2/4
=(√6+√2)/4
b=csinB/sinC
=5/[(√6+√2)/4]
=20/(√6+√2)
=5(√6-√2)