Common Core · High school
HSG-SRT.D.9
High school — Derive the formula A = ½ab·sin(C) for the area of a triangle. (+)
The skill that covers it
What a student should be able to do
- Choose between the law of sines and the law of cosines.
- Find a missing side or angle in an oblique triangle.
- Find the area of a triangle from two sides and the included angle.
- Apply the laws to navigation and surveying problems.