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JP = 39 cm
r = 7
R= ?
PGSPD² = JP² - (R + r)²
(R + r) =
R + 7 =
R + 7 =
R + 7 =
R + 7 = 15
R = 15 - 7
R = 8
⇔ p . j . (R-r) persukutuan luar
4. ⇒ p . j . (R+r)
36 . 39 . (7+r)
36 . 39 . 60 [(7+r)] tryple pytagoras
≈ 7+r=60
r =60-7 pindah ruas
r =53
5. ⇒ p . j . (R-r)
15 . 17 . (10-r)
15 . 17 . 8[(10-r)] tryple pytagoras
≈ 10-r=8
r =8+10 pindah ruas
r =18