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= < ABC
= 55
< ADC = sdt pusat
= 2 x sdt kelilng
= 110
2. < PST = sdt keliling
= 1/2 x sdt pusat
= 1/2 x 160
= 80
< PRQ = sdt keliling
= 80
3. soal kurang jelas
a= sdt pusat = 2 x sdt didepannya
b = sdt keliling = 1/2 x sdt pusat