Tolong bantu jawab no 9 pake cara

Sama soalnya?

10² = 6² + b²
100 = 36 + b²
64 = b²
8 = b

17² = 8² + b²
289 = 64 + b²
225 = b²
15 = b

cotan = samping/depan = 15/8

jawab (A)