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| A right triangle whose acute angles are 30o and 60o. It is the result of splitting an equilateral triangle in half using a line of symmetry. |
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| A right triangle whose base angles are each 45°. Because of the converse of the isosceles triangle theorem it is also an isosceles triangle. |
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| An angle whose measure is less than 90o. |
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| A segment that is perpendicular to the altitude of a polygon. Rectangles, parallelograms and trapezoids have _____s in pairs that are parallel to each other. |
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| Two angles whose sum is 90°. |
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| One of the two non-parallel sides of a trapezoid. |
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| leg (of a right triangle) |
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| One of the two sides that form the right angle of the right triangle. |
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| Two angles that share a vertex and a side and whose other sides form a line. |
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| The point that is equidistant from the endpoints of the segment. |
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| An angle whose measure is greater than 90o but less than 180o. |
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| Two coplanar lines that never intersect. On a coordinate plane their slopes are the same. |
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| Any quadrilateral with two pairs of opposite sides parallel. |
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| Two lines that intersect to form right angles. |
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| A set of three whole numbers, such as 3, 4 and 5, that work in the Pythagorean Theorem. |
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| A polygon with four sides. |
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| Any quadrilateral with four right angles. |
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| The region enclosed by two radii and the part of the circle between the endpoints of the radii on the circle. Think of it like a piece of pie. |
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Definition
| Two angles whose sum is 180°. |
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| Any quadrilateral with four congruent sides. |
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| A quadrilateral with exactly one pair of parallel sides. |
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| Two angles formed by intersecting lines that are opposite each other. |
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