Q: Precalculus 7.2 Unit Circle w/ review

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What is the Unit Circle?

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The Unit Circle is a circle with a radius of 1, centered at the origin of a coordinate plane. It is used to define trigonometric functions.

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What is the significance of the radius in the Unit Circle?

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The radius of the Unit Circle is equal to 1, which simplifies the calculations of sine, cosine, and tangent values.

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How do you find a coterminal angle?

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To find a coterminal angle, add or subtract multiples of 360° (for degrees) or 2π (for radians) from the given angle.

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What is the sine function in relation to the Unit Circle?

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The sine function represents the y-coordinate of a point on the Unit Circle corresponding to a given angle.

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What is the cosine function in relation to the Unit Circle?

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The cosine function represents the x-coordinate of a point on the Unit Circle corresponding to a given angle.

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What is the tangent function in relation to the Unit Circle?

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How do you calculate the height of an object using the angle of elevation?

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Use the formula: height = distance * tan(angle of elevation).

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What is the relationship between sine and cosine for complementary angles?

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