Question

if ABC=9 and AB+BC+CA=40 find asquare + b square + c square

Answer 1

i hope it's hel0ful for you

Answer 2

We Know that....

(a+b+c)^2=a^2+b^2+c^2+2ab+2bc+2ca

so by putting the values...

9^2=a^2+b^2+c^2+40

or ...

a^2+b^2+c^2=81-40

=41