Tolong pakai cara ya kak besok dikumpulin

L1 = P x l
L1 = 7cm x 9cm = 63 [tex] cm^{2} [/tex]

L2 = P x L
L2 = ( 9cm - 2cm ) x 2cm
L2 = 6cm x 2cm = 12 [tex] cm^{2} [/tex]

L3 = ( 12cm - ( 7cm + 2cm ) x 4cm
L3 = (12 cm - 9 cm ) x 4cm
L3 = 3cm x 4cm
L3 = 12[tex] cm^{2} [/tex]

LT = L1 + L2 + L3
LT = 63 [tex] cm^{2} [/tex] + 12 [tex] cm^{2} [/tex] + 12 [tex] cm^{2} [/tex]
LT = 87 [tex] cm^{2} [/tex]

Maaf kalau salah : )