# Thread: Sine rule help! + pics

1. ## Sine rule help! + pics

Hi everyone, new user on here!

I have an assignment in tomorrow which i have been trying to do for months! I will give you the question and hopefully some of you might be able to help me, i will also include a picture i drew

Question

"In the diagram below (Fig 1)AB is the inclined jib of a crane and is 10m long. AC is 4m long. Using the sine rule, calculate the inclination of the jib to the vertical and the length of tie CB. "

Diagram:

Sorry its soo big. I hope someone can help me!

2. If the angle at C (the one on top of the upper slanty line) is 120 degrees, then the angle below is 60 degrees.

You have a side with length 10 and the measure of the angle opposite. You have a side with length 4 and you need the measure of the angle opposite.

Plug this information into the Law of Sines, and solve for the needed angle measure.

3. Thanks i think i have nearly got it!