Bantuin aku kak.buat skrng soalnya

A. Rusuk ab = 108/12 = 9
Rusuk ac = 180/12 = 15
Rusuk bc = 15^2 - 9^2 = 225-81=144 = 12

B. Axt/2 x 2 = 9x12 = 108
180+108+108+144 = 540