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* PQRS diputar sehingga mnjadi prsgi pnjng SPQR
AB / PS = AD/ PQ
20 / PS = 8/4
KALI SILANG
80 = 8PS
PS = 10 cm
KELILING = 2p + 2l
= 2.10 + 2. 4
=20 +8 = 28 cm