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25² = 20² + (9+BQ)²
(9+BQ)² = 625 - 400
9+BQ = √225
9+BQ = 15
BQ = 15 - 9
BQ = 6 cm
Perbandingan luas lingaran A dan lingaran B
= πra² : πrb²
= 9² : 6²
= 81 : 36
= 9 : 4
lingkaran 1 = π x 15 x 15 = 225
lingkaran 2 = π x 6 x 6 = 64
perbandigan = 225 : 64
= 9 : 4