Answer:
0.38
Explanation:
imagine a circle, with C being the center, and 13 being the radius.
the triangle is then representing the trigonometric functions. remember, they are all multiplied by the radius as the circle is much higher than the norm circle (radius 1).
so,
5 = sin(C) × 13
sin(C) = 5/13 = 0.384615385... ≈ 0.38