Applet: CAST Rule |
Applet: CAST Rule |
1) Drag the point P around the circle.
2) Observe the changes in the signs of the trigonometric ratios as you travel through each quadrant.
1) The measure of angle BOP, between the positive x-axis and the terminal arm OP.
2) The sin ratio of angle BOP.
3) The cos ratio of angle BOP.
4) The tan ratio of angle BOP.
McGraw-Hill Ryerson Mathematics 12:Preparing for College & Apprenticeship, Section 1.3, Page 15.
1) Use the applet to demonstrate the changes in the signs of trigonometric functions as the angle moves from acute to obtuse.
2) Extend the demonstration to angles in the third and fourth quadrants.
3) Use the applet to check solutions to trigonometric problems by finding the answer empirically.