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d2 = 12 + 12 = 24
L = 1/2 × d1 × d2
= 1/2 × 19 × 24
= 228 (A) No 5 = 1/4 × 22/7 × 14 × 14 = 154 cm²
luas 1/4 lingkaran
L = 1/4 x 22/7 x 14 x 14
= 154
no. 6
luas layang layang
L = (d1xd2) : 2
= (28x12) : 2
= 168