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| A plane figure with more than two sides. |
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| Two segments of a polygon that meet at a common vertex. |
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| A point in a polygon where two segments meet. |
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| A polygon such that at least one line containing a side of the polygon contains a point in the interior of the polygon. |
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| A polygon such that no line containing a side of the polygon contains a point in the interior of the polygon. |
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| Having all congruent sides. |
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| Having all congruent angles. |
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| An equiangular, equilateral polygon. |
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| A segment joining two non-consecutive vertices of a polygon. |
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| A triangle with no congruent sides. |
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| A triangle with two congruent sides. |
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| A triangle with three congruent sides. |
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| A triangle with three acute angles. |
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| A triangle with one right angle and two acute angles. |
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| A triangle with one obtuse angle and two acute angles. |
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| A segment joining the midpoint of one side of a triangle and the opposite vertex. |
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| The perpendicular segment from a vertex of a triangle to the opposite side or to the line that contains the opposite side. |
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| The point where the three medians of a triangle intersect. |
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| The point where the three altitudes of the triangle intersect. |
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| The point where the three angle bisectors of a triangle intersect. |
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| The point in a triangle where the three perpendicular bisectors intersect. |
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