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31 Cards in this Set
- Front
- Back
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Point
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Basic building block (a dot)
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Line segment
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Shortest distance between two points
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Ray
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Endpoint with a line in one direction
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Line
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Infinite number of points with the same slope
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Angle
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2 rays joined at endpoints
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polygon
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2-dimensional figure with 3 or more sides
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Endpoint
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The mark at the end of a line
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Vertex (plural: vertices)
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A point where two or more straight lines meet. A corner
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Acute angle
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An angle that measures LESS THAN 90°
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Right angle
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an angle that measures EXACTLY 90°
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Obtuse angle
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an angle that measures MORE THAN 90°
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Straight angle
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a straight line. The angle measurement is 180°
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Reflex angle
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An angle that measures MORE THAN 180°
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congruent angles |
angles that have the same angle measurement |
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Complementary angles
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Angles that form a right angle; angles that add to 90°
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Supplementary angles
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Angles that form a straight line; angles that add to 180°
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Adjacent angles
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Angles that touch one another
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Non-adjacent angles
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Angles that do not touch one another
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Vertical angles |
Each of the pairs of opposite angles made by two intersecting lines. |
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Linear pair |
a pair of adjacent, supplementary angles (angles add to 180 degrees). |
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alternate interior angles |
When two lines are crossed by another line (which is called the Transversal), the pairs of angles on opposite sides of the transversal but inside the two lines. Angles are congruent |
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alternate exterior angles |
When two lines are crossed by another line (which is called the Transversal), the pairs of angles on opposite sides of the transversal but outside the two lines. Angles are congruent |
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corresponding angles |
When two lines are crossed by another line (which is called the Transversal), the angles in matching corners are called corresponding angles. |
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same-side interior angles |
two angles that are on the same side of the transversal and on the interior of (between) the two lines |
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equilateral triangle |
A triangle in which all three sides are equal. This type of triangle is also equiangular; that is, all three internal angles are also congruent to each other and are each 60°. |
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isosceles triangle |
a triangle that has two sides of equal length. |
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scalene triangle |
a triangle that has no equal sides or angles |
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transversal |
a line that passes through two lines |
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trapezoid |
a 4-sided flat shape with straight sides that has a pair of opposite sides parallel. |
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parallelogram |
a four-sided figure with opposite sides parallel. |
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Similar triangles |
Triangles whose corresponding (matching) angles are congruent (equal in measure) and the ratio of their corresponding sides are in proportion |
