REASONING The foul lines of a baseball fi eld intersect at home plate to form a right angle. A batter hits a fair ball such that the path of the baseball forms an angle of 27 with the third base foul line.

Thickness x 3⁄8 x 1⁄2 In. x 5⁄8 k 19�. 15⁄8 111⁄16 113⁄16 19⁄16 15⁄8 11. 13⁄4 113⁄16 17⁄8 15⁄8 11. 111⁄16 13⁄4 17⁄8 15⁄8 11. 13⁄4 113⁄16 17⁄8 15⁄8 11. 13⁄4 113⁄16 17⁄8 111⁄16 13 .

The angle is formed by intersecting chords. (That's how it got its name.) The vertex will be a point in the interior of the circle. The angle will equal one half the sum of the intercepted arcs.

To find the value of a trigonometric function of an angle in the I, II, III, and IV quadrants by rotating clockwise, we will make use of the reference angle of the angle.

The question “What is the subtended arc of this angle?” is asked to let students notice the subtended arc, AB, of ∠AOB. Then, let students use another protractor, called C, to construct the angle at the …

Example: Rewrite each expression in terms of its reference angle, deciding on the appropriate sign.

Students describe the angle relationship in the diagram and set up and solve an equation that models it. Have students verify their answers by measuring the unknown angle with a protractor.