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Ra : Rb = 3:2
AB = 29 cm
D = 21 cm
maka :
D² = p² - (R+r)²
21² = 29² -(R+r)²
(R+r)² = 841 - 441
(R+r) = √400
R+r = 20
maka :
Ra = 3/5 x 20 = 12 cm
Rb = 2/5 x 20 = 8 cm
Sehingga,
Panjang garis singgung persekutuan dalam:
Dengan x = 4
DIdapat: