Trigonometry Terms
The given angle within the circle can be changed by moving the α' slider at the top (-2880 through 2880). Check boxes will display different content, it is advisable to limit your check to at most 2 or 3 at a time. Follow the instructions below initially.
All coterminal angles are an angles of different measure that share the same initial side and terminal side.
A reference angle is the acute angle formed by the terminal side and the x-axis. (The only values a calculator recalls are the reference angles.)
SohCahToa is a mnemonic device to assist in remembering the sine, cosine, and tangent ratios. (Memory Trigger)
The vectors of the sine and cosine are a visual representation of the values of the sine and cosine functions.