Intro to Similarity

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What is similarity in geometry?

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Similarity in geometry refers to the relationship between two shapes that have the same shape but may differ in size. Their corresponding angles are equal, and their corresponding sides are in proportion.

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What are corresponding angles?

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Corresponding angles are angles that are in the same position in different shapes. If two shapes are similar, their corresponding angles are equal.

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What are corresponding sides?

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Corresponding sides are sides that are in the same position in different shapes. In similar shapes, the lengths of corresponding sides are proportional.

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What is a scale factor?

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A scale factor is a number that scales, or multiplies, some quantity. In similar figures, it is the ratio of the lengths of corresponding sides.

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What is the relationship between the angles of similar triangles?

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How do you find the scale factor between two similar triangles?

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To find the scale factor, divide the length of a side of one triangle by the length of the corresponding side of the other triangle.

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What is the significance of the AA criterion for similarity?

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The AA (Angle-Angle) criterion states that if two angles of one triangle are equal to two angles of another triangle, then the triangles are similar.

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