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8² = 17² - (10 + r)²
64 = 289 - (10 + r)²
(10 + r)² = 289 - 64
(10 + r)² = 225
10 + r = √225
10 + r = 15
r = 15 - 10
r = 5 cm
39) PQ² = AB² - (AP + BQ)²
20² = 25² - (9 + BQ²
400 = 625 - (9 + BQ)²
(9+BQ)² = 625 - 400
(9+BQ)² = 225
9 + BQ = √225
9 + BQ = 15
BQ = 15 - 9
BQ = 6 cm
perbandingan luas
AP² : BQ²
9² : 6²
81 : 36
9 : 4 (C)
40) sudut yg dibentuk adalah 90° (C)