.在△ABC中a=15,∠A=600,则 (a+b+c)/(sinA+sinB+sinC )=__________

问题描述:

.在△ABC中a=15,∠A=600,则 (a+b+c)/(sinA+sinB+sinC )=__________
∠A=60°不是600

由题意知:
a/sinA=b/sinB=c/sinC
所以
(a+b+c)/(sinA+sinB+sinC )= a/sinA = 15/sin60°=10根号3