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p = 20 cm
R = 7 cm
r = 5 cm
maka :
d² = p² - (R+r)²
d² = 20² - (7+5)²
d² = 400 - 144
d = √256
d = 16 cm
jadi panjang garis persekutuan dalam adalah 16 cm
20²=D²+(7+5)²
400=D²+144
400-144=D²
D²=256
D=√256
D=16 cm