基礎math-u07-d01
In a right-angled triangle the side opposite the angle theta is 5 and the hypotenuse is 13. Then sin theta is:
A. 5/13✓ 答案
B. 12/13
C. 5/12
D. 13/5
解說
Sine is the opposite side over the hypotenuse, so sin theta = 5/13. The 12 would be the adjacent side and the cosine.