indirakusuma
L = luas jajar genjang + luas trapesium = a x t + 1/2 (a+b) x t = 20 x (26-12) + 1/2 (12+26) x 9 = 20 x 14 + 1/2 x 38 x 9 = 280 + 171 = 451 cm² (C)
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Avicennaa
Luas ABCDEF = luas trapesium + luas jajargenjang = (12+26)/2 x 9) + (20 x 14) = 171 + 280 = 451 (C)
= a x t + 1/2 (a+b) x t
= 20 x (26-12) + 1/2 (12+26) x 9
= 20 x 14 + 1/2 x 38 x 9
= 280 + 171
= 451 cm² (C)
= (12+26)/2 x 9) + (20 x 14)
= 171 + 280
= 451 (C)