kak tolong bantuin dong pake cara ya

[tex] 40cm^{2} [/tex] = [(3+2)x8]:2
ternyata 40 =2(20)
maka ad=3(2) = 6
[tex] AC^{2} [/tex] = 6^2 + 8^2
                             =36+64
                             =100
maka ac = 10