8 relations: Angle, Congruence (geometry), Euclidean geometry, Internal and external angles, Scaling (geometry), Similarity (geometry), Transversal (geometry), Triangle.

## Angle

In plane geometry, an angle is the figure formed by two rays, called the sides of the angle, sharing a common endpoint, called the vertex of the angle.

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## Congruence (geometry)

In geometry, two figures or objects are congruent if they have the same shape and size, or if one has the same shape and size as the mirror image of the other.

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## Euclidean geometry

Euclidean geometry is a mathematical system attributed to Alexandrian Greek mathematician Euclid, which he described in his textbook on geometry: the Elements.

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## Internal and external angles

In geometry, an angle of a polygon is formed by two sides of the polygon that share an endpoint.

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## Scaling (geometry)

In Euclidean geometry, uniform scaling (or isotropic scaling) is a linear transformation that enlarges (increases) or shrinks (diminishes) objects by a scale factor that is the same in all directions.

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## Similarity (geometry)

Two geometrical objects are called similar if they both have the same shape, or one has the same shape as the mirror image of the other.

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## Transversal (geometry)

In geometry, a transversal is a line that passes through two lines in the same plane at two distinct points.

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## Triangle

A triangle is a polygon with three edges and three vertices.

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