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What are the two types of trigonometry?
Trigonometry based on a unit circle and radians and trigonometry based on a right triangle.
What is the value of cosine at pi?
Looking at a unit circle, cosine is the horizontal coordinate. Pi radians is halfway around the circle (180°), so the coordinate is (-1,0). Cosine(pi) = -1
What measurements are in a circle?
Within a circle, the units used for measurement are either in degrees or in radians. In addition, radius and diameter are used, which can be in any unit of length, are important dimensions from which size, area, and circumference are obtained.
How can you measure a square meter?
Using a meter stick, measure out a meter. Then turn pi/2 radians according to the unit circle and measure out another meter.
What is a period of a trigonometry function?
The period of a trigonometric function, since it depends on the angle of a ray centered in a unit circle, is 2 pi radians or 360 degrees.
