Solve triangles using the law of sines

BC = 18.7

Step-by-step explanation:

Here, we want to solve the triangle using the law of sines

According to the law, the ratio of the measure of the side of a triangle and the sine of the angle that faces the side is a constant for all sides of the triangle

Mathematically;

a/sin A = b/sin B = c/sin C

with reference to this particular triangle, we have it that;

20/sin 80 = BC/ sin 67

BC = 20 * sin 67/sin 80

BC = 18.7