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sehingga nanti ketemu :
RQ sebangun dg RS
PR sebangun dg TR
PQ sebangun dg TS
sehingga dpt dipakai persamaan :
RQ[tex] \frac{RQ}{RS} = \frac{PR}{RT}
[tex] \frac{21}{12} = \frac{PR}{8}
12PR = 21 x 8
PR = 168 /12
PR = 14cm
PR = PS + RS
14 = PS + 12
PS = 14-12
PS = 2 cm
semoga bermanfaat :)