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AP = r₁ = 15 cm
BR = r₂ = 10 cm
MN = 30 cm
Maka,
BN = MN + BM
BN = MN + r₂
BN = 30 + 10
BN = 40 cm
AN = MN + AM
AN = MN + r₁
AN = 30 + 15
AN = 45 cm
Dengan phytagoras:
PN² = AN² - AP²
PN² = 45² - 15²
PN² = 2.025 - 225
PN² = 1.800
PN = √1.800
PN = 30√2 cm
RN² = BN² - BR²
RN² = 40² - 10²
RN² = 1.600 - 100
RN² = 1.500
RN = √1.500
RN = 10√15 cm
Sehingga,
PN : RN
Adalah:
30√2 : 10√15
Bagi masing-masing dengan 10
3√2 : √15 [D]