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d2= 12cm × 2 = 24cm
QR = 20 cm
PQ = 13 cm
Dit: L dan K layang-layang
Penye:
L = ½ × d1 × d2
L = ½ × 21 × 24
L = 252 cm²
K = 2 × (PQ + QR)
K = 2 × (13 + 20)
K = 2 × 33
K = 66cm
semoga membantu :)