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23 Cards in this Set
- Front
- Back
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Angle
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two rays that begin at the same point
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Vertex
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the point of an angle where the two rays intersect
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Congruent Angles
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two or more angles with the same measure
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Acute Angle
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an angle that measures between 0° and 90°
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Right Angle
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an angle that measures 90°
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Obtuse Angle
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an angle that measures between 90° and 180°
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Straight Angle
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an angle that measures 180°
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Complementary Angles
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any two angles whose sums measure a total of 90° (note spelling!)
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Supplementary Angles
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any two angles whose sums measure a total of 180°
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Vertical Angles
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congruent angles that are formed by intersecting lines
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Corresponding Angles
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angles that are formed when a line intersects a pair of parallel lines
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Horizontal Line Symmetry
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a figure that can be divided by a horizontal line into two symmetrical parts
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Vertical Line Symmetry
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a figure that can be divided by a vertical line into two symmetrical parts
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Rotational Symmetry
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a figure that coincides with itself after rotating 180° or less around a point
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Scalene Triangle
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a triangle with all different side lengths and angle measurements
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Isosceles Triangle
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a triangle with at least two equal side lengths and angle measurements
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Equilateral Triangle
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a triangle with all the same side lengths
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Acute Triangle
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a triangle that has three acute angles
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Equiangular Triangle
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a triangle with all the same angle measurements
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Obtuse Triangle
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a triangle with one obtuse angle
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Right Triangle
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a triangle with one right angle
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The Formula for the Sum of Interior Angles
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180° (n - 2)
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What is the sum of any polygon's exterior angles, regardless of the amount of sides?
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360°
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