Jawabanmu

2014-03-25T17:30:22+07:00
OB = 8, segitiga AOB siku2 di B,,,
maka:

1. AB= 15,  OA =   \sqrt{AB^{2} +  OB^{2}  } = \sqrt{ 15^{2} +  8^{2}  } = 17

2. <O = 60, <B= 90, maka <A= 180 - 90 - 60 = 30 derajat