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Definition
| a simple closed plane curve made up of three straight line segments. more specifically a polygon formed by three non collinear segments connected at their indpoints. the segments themselves are called the sides of the triangle. the endpoints of the segments are called the vertices of the triangle and the union of any pair of segments is called an angle of the triangle |
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Definition
| every triangle has three vertices, three sides, and three angles |
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Definition
| with reference to a given segment, this is the angle which does not contain the given segment as a side. |
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Term
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Definition
| with reference to a given angle, this is the segment which is not included as a side of the given angle |
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Definition
| an angle formed by two sides of a triangle, usually referred to as the angle included by the sides. |
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Definition
| the side shared by two angles of a triangle, usually referred to as teh side included by the two angles. |
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Definition
| a segment drawn from a vertex of a triangle to the midpoint of its opposite side |
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Term
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Definition
| a segment drawn from a vertex of a triangle perpendicular to its opposite side. Note: in some cases an altitude may lie outside teh triangle and will be perpendicular to the line containing the opposite side |
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Term
| exterior angle of a polygon |
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Definition
| the angle formed when one side of a polygon is extended. Note: an exterior angle of a triangle forms a linear pair with the adjacent interior angle of the triangle. further the two angles of the triangle that are not adjacent to the exterior angle are called the remote interior angles of that exterior angle |
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