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12² = 13² - (3+r)²
144 = 169 - (3+r)²
(3+r)² = 169-144
(3+r)² = 25
3+r = √25
3+r = 5
r = 2
Luas lingkaran A : Luas lingkaran B
π r ² : π r ²
r² : r²
2² : 3²
4 : 9
Itu sih menurut jawaban aku