Question

已知a,b,c为△ABC的三边,并且a+b+c=60cm,a/3=b/4=c/5.求△ABC的面积

Answer 1

=4/3*a,c=5/3*a

a+b+c=4a=60

a=15,b=20,c=25

a^2+b^2=c^2

S△ABC=1/2*a*b=150