Needed

a contractor is building a house. he first marks out three points a, b and c on the ground such that ab=5m, ac=7 m and angle bac=112°. find the length of bc.

For this, you will need to use the Law of Cosines. You should plug it in as show :

Square root of((5^2+7^2-2(5)(7)cos(112)))
You will take that answer, and square it. Once plugged into a calculator, the answer is:

42.0821 meters

I hope this Helps!

I’m vary good with science if you need with that

The operation is suck a c@ck? !