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Luas = 1/2 x dig1 x dig2 = 1/2 x 12 x 6 = 36 cm² (b)
Gambar yang atas adalah trapesium
Luas = 1/2 x jumlah sisi sejajar x tinggi = 1/2 x 45 x 12 = 270 cm² (c)
d1 = 3 + 3 = 6
d2 = 5 + 7 = 12
L = d1 x d2 x 1/2
= 6 x 12 x 1/2
= 36 cm²
= B
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L = (a+b) x t/2
= (20+20+5) x 12/2
= 45 x 6
= 270 cm²
= C