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# What is a vertex angle?

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A vertex angle refers to the angle that is formed by the two lines crossing at a vertex. When asked for a vertex angle, the intended query is typically for the size of the angle in degrees or radians.

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A vertex is the result of two non-perpendicular lines intersecting, often forming a corner of a shape. For example, a square has four vertices due to having four sides and four corners. The angle of a vertex is measured on the inside of the shape. For a square, the angle would be measured between two connected sides, which would always be 90 degrees.

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## Related Questions

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In geometry, a vertex is defined as a point where two or more lines meet. A triangle has three vertices. A parallelogram has four vertices. A six-sided figure has six vertices. A pentagon is a five-sided figure and has five vertices.

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Altitude in geometry (also known as height) refers to a segment that extends from any vertex of a triangle and is perpendicular to the line found on the opposite side. This term is also employed to refer to the length of this segment.

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A median is a line segment that joins any vertex of a triangle to the midpoint of the opposite side of the triangle. A triangle has three sides and three vertices. Hence, it has three medians. A median divides a triangle into two equal halves of equal area.