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A= 1/2 b

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~Central angles are double their corresponding inscribed angles

~If the central angle is a diameter, then its inscribed angle is 90 degrees

~Opposite angles in a inscribed quadrilateral are supplementary

~A circumscribed angle and its corresponding arc are supplementary

~Where a radius and a tangent meet are 90 degrees

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If you are scaling up or down a shape and know the scale factor, the area’s scale factor is squared and the volume’s scale factor is cubed.

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Surface Area: add up all the sides

Volume: area of the base multiplied by the height

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Radian is a way to measure angles, similar to degrees but a different system. The definition of a radian is the ratio of arc length to radius.

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formula-
n/360(2pi r)

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You can find the center of rotation of any object by connecting the corresponding
points and finding the perpendicular bisector of each. Where all perpendicular
bisectors intersect is the center of rotation.