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Pre Calculus

Francis Bustrillo

Created on October 2, 2021

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Transcript

Reference Angle

and

COORDINATES OF A POINT ON THE UNIT CIRCLE

Reference Angle

The reference angle is always positive. In other words, the reference angle is an angle being sandwiched by the terminal side and the x-axis. It must be less than 90 degree, and always positive.

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Quadrant 3

Quadrant 1

Quadrant 2

Reference Angle

Quadrant 4

COORDINATES OF A POINT ON THE UNIT CIRCLE

A unit circle is a circle whose center is at the point of origin and have a radius of 1 unit. Given by the equation đ‘„^2 + 𝑩^2 = 1. Also, the measure of the length of arc is equal to the measure of the central angle. That is, 𝑠 = 𝜃..

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