Question

在三角形ABC中,∠C=Rt∠,BC中线AD=7,AC中线BE=4,求AB的长?

Answer 1

AC=b BC=a

b^2+(a/2)^2=49

a^2+(b/2)^2=16

两式相加

5/4(a^2+b^2)=65

c^2=52

c=2根号13