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kalau segitiga sm sisi :
a) 120
b) 120
c) 30
d) 30 : 120 = 1: 4. Berarti 12.4 =48 cm
maka sudut QPR = sudut YXZ = 30°
dan sudut PRQ = sudut XZY = 180 - 120 - 30 = 30°
dan sudut XYZ = sudut PQR = 120°
Karena segitiga PQR san YXZ adalah segitiga sama kaki, maka QR = XY = 12