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20 Cards in this Set
- Front
- Back
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Definitions
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Definitions
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Complementary angles
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two angles whose measures add up to 90 degrees
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supplementary angles
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two angles whose measures add up to 180 degrees
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theorem
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a statement that can be proved
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vertical angles
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to angles formed by intersecting lines and facing opposite directions
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transversal
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a line that intersects two lines in the same plane at different points
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corresponding angles
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pairs of angles formed by two lines and a transversal that make a F pattern
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same-side interior angles
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pairs of angles formed by two lines and a transversal that make a C pattern
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Alternate interior angles
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pairs of angles formed by two lines and a transversal that make a Z pattern
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congruent triangles
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triangles in which corresponding parts (sides and angles) are equal in measure
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similar triangles
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Triangles in which corresponding angles are
equal in measure and corresponding sides are in proportion (ratios equal) |
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Angle bisector
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A ray that begins at the vertex of an angle and
divides the angle into two angles of equal measure |
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Segment bisector
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A ray, line or segment that divides a segment
into two parts of equal measure |
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Legs of an
isosceles triangle |
The sides of equal measure in an isosceles
triangle |
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Base of an
isosceles triangle The third side of an isosceles triangle |
The third side of an isosceles triangle
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Equiangular Having angles that are all equal in measure
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Having angles that are all equal in measure
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Perpendicular
bisector |
A line that bisects a segment and is
perpendicular to it |
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Altitude
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A segment from a vertex of a triangle
perpendicular to the line containing the opposite side |
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Geometric mean
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The value of x in proportion
a/x = x/b where a, b, and x are positive numbers (x is the geometric mean between a and b) |
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Sine, sin
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For an acute angle of a right triangle, the ratio
of the side opposite the angle to the measure of the hypotenuse. (opp/hyp) |
