May 15, 2015

<p>Students understand that the Law of Sines can be used to find missing side lengths in a triangle when you know the measures of the angles and one side length.<br/>Students understand that the Law of Cosines can be used to find a missing side length in a triangle when you know the angle opposite the side and the other two side lengths.<br/>Students solve triangle problems using the Laws of Sines and Cosines.</p><p>Teacher and Student versions of full lesson from engageNY</p>

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Make sense of problems and persevere in solving them.

Reason abstractly and quantitatively.

Use appropriate tools strategically.

Attend to precision.

Look for and make use of structure.

(+) Prove the Laws of Sines and Cosines and use them to solve problems.

(+) Understand and apply the Law of Sines and the Law of Cosines to find unknown measurements in right and non-right triangles (e.g., surveying problems, resultant forces).