IndietroCommon Values of Sine, Cosine, & Tangent definitions
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1/15IndietroSkip to main contentIndietroUnit Circle
A circle with radius one, used to relate angles to coordinates where X and Y represent cosine and sine values. First Quadrant
The section of the unit circle where angles from 0 to 90 degrees are visualized, often using the left hand rule. Cosine
The X-coordinate of a point on the unit circle corresponding to a given angle, often found using memorization methods. Sine
The Y-coordinate of a point on the unit circle for a specific angle, determined by counting or finger rules. Tangent
A value calculated by dividing the Y-coordinate by the X-coordinate for a given angle, often simplified by rationalizing. 123 Rule
A memorization technique for common trig values, involving counting clockwise and counterclockwise around the unit circle. Left Hand Rule
A visual method using fingers to represent angles and count values for sine, cosine, and tangent in the first quadrant. Square Root Property
A simplification method where trig values are expressed as the square root of a number divided by two. Rationalized Denominator
A process of rewriting fractions so the denominator contains no radicals, often used for tangent values. Common Angles
Frequently used angles in trigonometry, specifically 30, 45, and 60 degrees, with easily memorized trig values. X Value
The horizontal coordinate on the unit circle, representing the cosine of an angle. Y Value
The vertical coordinate on the unit circle, representing the sine of an angle. Base
The horizontal side of a triangle formed by a point on the unit circle, corresponding to the cosine value. Height
The vertical side of a triangle formed by a point on the unit circle, corresponding to the sine value. Denominator
The bottom part of a fraction in trig values, often simplified or rationalized for clarity.
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