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r = 7 cm
d = 20 cm
d² = p² - (R + r)²
p² = d² + (R + r)²
p² = 20² + (8 + 7)²
p² = 400 + 225
p² = 625
p = 25 cm
jarak antar pusat 25 cm
semoga membantu ya :)
400 = - 225
400 + 225 =
= AB
25 = AB
cat = AB adalah jarak kedua lingkaran
semoga membantu