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OA = √20" - 12"
= √400 - 144
= √ 256 = 16
OC = √13" - 12"
OC = √169 - 144
OC = √25 = 5
jadi, panjang diagonal 2 adalah AO + CO = 16 + 5 = 11
L = d1 . d2/ 2
= 24 . 11/2= 12.11 = 132 cm2