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qp = 16
12.16 = 192
192 = 20 . QR . 1/2
192 = 10. QR
19,2 = QR
=√400- 144
=√256
=16 cm
Luas segitiga = (PQ x OQ) : 2 = (16 x 12) : 2 = 96 cm²
Luas layang layang = 2 xluas segitiga
= 96 x 2 = 192 cm²
Luas layang-layang = 1/2 x OP x QR
192 = 1/2.20.QR
192=10 x QR
QR = 192 :10 =19,2 (c)