CPM Homework Banner

Home > CCA2 > Chapter 10 > Lesson 10.2.1 > Problem 10-102


Use reference angles, the symmetry of a circle, and the knowledge that tan to write three other true statements using tangent.

Draw the angle and corresponding right triangle in the first quadrant. Recall that tangent is opposite/adjacent, and label the side lengths. Unit circle, right triangle in first quadrant, labeled as follows: vertical leg, 0.3640, angle opposite vertical leg, 20 degrees.

Redraw your triangle in each of the other quadrants. Label the side lengths with the correct sign. Added to unit circle, right triangle in second, third, & fourth quadrants. Triangle in third quadrant, vertical leg labeled, negative 0.3640.

One possible statement: tan A small red arc, from the positive, x axis, to the hypotenuse, of the right triangle, in the third quadrant.