Question

Two points A and B lie on opposite sides of a river. Another point C is located on the same side of the river as B at a distance of 250 ft from B. If angle ABC is 100° and angle ACB is 20°, find the distance across the river from A to B.

Answer 1

start by drawing a diagram



start by finding x, using angle sum of a triangle...

the to find AB( or c) is the law of sines...

hope it helps