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(a+b)xt:2= (9+22)x6 : 2 = 31 x 6 : 2 = 186 : 2 = 93 cm²
Jadi, 186 cm² + 93 cm² = 279 cm²
KALO SALAH MAAF
L = (½×(22+9)×12) + (½×(22+9)×6)
L = (½×31×12) + (½×31×6)
L = (½×372) + (½×186)
L = 186 + 93
L = 279 CM²