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Key concepts
- Apply the Cosine Law
This video gives an explanation of how to solve using the Cosine Law. The formulas are given on the SL formula sheet and they are shown below.
Watch the video to learn how to solve!
MISSING SIDE
- Identify SAS
- Substitute x as "c" in equation
- Solve for x squared
- Square root x for answer
EQUATION SOLVER
- Find SAS (make sure x is in correct spot)
- Make equation equal to zero
- Plug in equation to equation solver (use 10 and -10 to get both answers)
MISSING ANGLE/SIDE
- Divide by 2ab to find cosine equation
- Plug in 7,5, and 10
- Subtract 112 from 180 to find angle A
- Start new cosine equation
- Solve for x squared
- Square root for final answer
SUMMARY
This lesson is all about how to solve a triangle using Cosine Law. The formulas will be given, so knowing how to solve is simple, just make sure you have all the parts of the triangle you need to solve. This lesson is an important part of Pre-cal, so be sure you know how to do it before moving onto the next lesson!
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