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R = 7 cm
r = 5 cm
P = 20 cm
maka :
D² = P² - (R+r)²
D² = 20² - (7+5)²
D² = 400 - 144
D = √256
D = 16 CM
Jadi pjang grs singgung persekutuan dlm = 16 cm
gsd² = 20² - (7+5)²
gsd² = 400 - 12²
gsd² = 400 - 144
gsd² = 256
gsd =√256
gsd = 16 cm