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= 180 - (60 + 60)
= 180 - 120
= 60°
karena semua sudutnya 60°, maka segitiga ini merupakan segitiga sama sisi sehingga AB = BC = CA
keliling segitiga = 15 + 15 + 15
= 45 cm
3). Keliling = PQ + QR + PR
40 = 12 + 12 + PR
40 = 24 + PR
40 - 24 = PR
PR = 16cm