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luas = aXt/2 = 15X20/2 = 150 cm
alas 15 dan tinggi 20 krna segitiga trsbt siku"
sisi-sisi = 15 cm,25 cm,20 cm
*ditanya
a.keliling( k )
k = 15+25+20
= 60 cm
yang b. di gmbar ya