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persekutuan luar = CD
jari 1 = CA
jari 2 = DB
jarak kedua pusat = AB
AB kuadrat = √ CD kuadrat + (r1-r2) kuadrat
= √ 12kuadrat + (7-2) kuadrat
= √ 144 + 25
= √ 169 = 13 cm
144=? ( 7+2)2
144=?- 81
p2=144-81
p2=63
P=√63