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21 Cards in this Set
- Front
- Back
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an exact location |
Point |
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a straight path that extends without end in opposite directions |
Line |
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part of a line that includes 2 endpoints |
Line segment |
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part of a line that has one endpoint and continues without end in one direction |
Ray |
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flat surface that extends in all directions |
Plane |
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formed by 2 rays with the same endpoint (vertex) |
Angle |
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measures 90 |
Right angle |
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measures between 0 and less than 90 (0 - 90 ) |
Acute angle |
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measures greater than 90 and less than 180 (90 - 180 ) |
Obtuse angle |
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measures exactly 180 |
Straight angle |
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lines in the same plane that NEVER intersect ( II ) |
Parallel lines |
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lines that cross at one common point |
Intersecting lines |
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lines that intersect to form right angles ( + ) |
Perpendicular lines |
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lie in different planes, neither parallel nor intersecting |
Skew lines |
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the sum of the measures of the angles = 180 |
Triangles |
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only acute angles |
Acute triangle |
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only one (1) obtuse angle |
Obtuse triangle |
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one (1) right angle |
Right triangle |
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no congruent sides |
Scalene |
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at least two (2) congruent sides |
Isosceles |
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has three (3) congruent sides |
Equilateral |
