In triangle ABC, angle C = 90 AC = 13 AB = 20 find sinB.

The sine of the angle is equal to the ratio of the opposite leg to the hypotenuse.

1. In the triangle ABC, the angle C is 90 degrees, which means AB is the hypotenuse, and AC and BC are the legs.

2. The opposite leg for angle B is AC.

3. So, to find the sine of the angle B, you need to divide AC by AB. AC = 13, AB = 20, hence:

sinВ = 13/20