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p²= 6²+3²
p²=36+9
p²=45
p=^45
p=6,7
R = titik tengah garis bc
tarik garis dr titik P ke titik R
sehingga ada segitiga PQR
PQ = 6cm
QC = 3 cm
Pakai rumus pythagoras
PR = √6² + 3²
= √45
= 3√5 cm