May 14, 2015

Students use graphing calculator to find the values of sin ? and cos ? for ? between 0 and 90.

Students solve for missing sides of a right triangle given the length of one side and the measure of one of the acute angles.

Students find the length of the base of a triangle with acute base angles given the lengths of the other two sides and the measure of each of the base angles.

Teacher and Student versions of full lesson from engageNY

- Mathematics > General
- Mathematics > Geometry

- Grade 9
- Grade 10

Reason abstractly and quantitatively.

Use appropriate tools strategically.

Attend to precision.

Look for and make use of structure.

Explain and use the relationship between the sine and cosine of complementary angles.