The easiest way to find the width of the river is to use the tangent function of a right triangle. The base of your triangle is the 278 m that was measured along the river bank. The vertical side opposite the measured angle is the distance you are trying to find.
The tangent of an angle equals the opposite side divided by the adjacent side of the triangle. Remember SOH CAH TOA? Tangent = opposite/adjacent.
Answer:
The answer is 135
Step-by-step explanation:
You do 180/12 and you get 15, then do 9*15 and you get 135 which is your answer.
