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A line is a series of points that extends in two opposite directions indefinitely. |
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A segment is part of a line with two endpoints. You name a segment by its endpoints. |
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A point is a location in space. You name a point with any capital letter. |
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A ray is part of a line and has only one endpoint. The other side continues indefinitely. |
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| An angle with its measure over 90°, but not at or over 180°. |
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| An angle that has a measure of less than 90°. |
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| An angle that measures exactly 90°. |
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| Two or more angles that add up to 90°. |
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| Two or more angles that add up to 180°. |
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| Formed by two intersecting lines. |
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| A triangle that has one obtuse angle. |
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| A triangle that has all acute angles. |
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| A triangle that has one right angle. |
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| A triangle with all sides different measures. |
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| A triangle with the sides all equal lengths. |
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| A triangle with two sides the same length. |
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| A polygon with four sides. |
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| A quadrilateral that has four right angles. |
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| A quadrilateral with four congruent sides. |
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| A special quadrilateral that has both four right angles and four congruent sides. |
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| A quadrilateral that has exactly one pair of parallel lines. |
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| A quadrilateral that has two pairs of parallel lines. |
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1. Congruent segments have the same length.
2. Congruent figures have the same size and shape. |
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| Similar figures have the same shape, but not nessesarily the same size. Corresponding angles of similar figures are congruent. Corresponding sides of similar figures are proportional. |
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| A transformation that turns a figure about a center point. |
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| A transformation that flips a figure over a line. |
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| A transformation that moves every point of a figure the same distance in the same direction. |
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| An angle with a measure of exactly 180°. |
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