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20cm kuadrat= JTPkuadrat - (8+7)kuadrat
400cm= JTPkuadrat - 15kuadrat
400cm= JTPkuadrat- 225cm
JTPkuadrat= 400cm + 225cm
JTPkuadrat= 625
JTP= akar dari 625
JTP= 25cm
r = 7 cm
d = 20 cm
S =
=
=
=
= 25 cm
Jarak kedua pusat = 25 cm