\n The red circle shown in the MagicGraph is a unit circle — meaning its radius \\(R = 1\\).
\n \\(P (X, Y) \\) is a point on this circle. The line connecting \\(P\\) to the center of the circle forms an angle \\(\\theta\\) with the X-axis. Then, at any given value of \\(\\theta\\), the X and Y coordinates of point \\(P\\) can be expressed as —\n $$X = R \\cos \\theta = \\cos \\theta$$\n and\n $$Y = R \\sin \\theta = \\sin \\theta $$\n Further,\r\n $$\\tan \\theta = \\sin \\theta/\\cos\\theta = Y/X$$\r\n
Thus, from the knowledge of the two coordinates of point \\(P\\), one can determine all the trigonometric ratios.\r\n
\r\n Use the MagicGraph below to participate in the exercise and record your answers. Tap on button to move over to the next question.\r\n Tap on button to check your answer.\r\n Tap on button to start over from the begining.\r\n
\r\n
\r\n — is the 'Next' button. Tap on this button to move over to the next question.
\r\n — is the 'Check Your Answer' button. Tap on this button to check your answer.
\r\n — is the 'Get a Hint' button. Tap on this button to receive a hint on how to solve this problem.
\r\n — is the 'Start Over' button. Tap on this button to start over the exercise from the begining.\r\n
\r\n The marks and indications are located on the top-left corner of the MagicGraph, and show your attempt status.
\r\n — the right checkmark indicates that your attempted response was correct.
\r\n — this crossmark indicates that your attempted response was incorrect.
\r\n — this exclaimation mark indicates an unattempted (missed) response.
\r\n