Term | Definition |
Line | a straight path of points that goes on in 2 direction |
Ray | part of a line. I has only one endpoint and extends forever in one direction |
parallel lines | never cross and stay the same distance apart |
perpendicular lines | are intersecting lines that form square corners |
point | an exact location in a space |
line segment | part of a line and has 2 endpoints |
plane | an endless flat surface |
angle | formed by two rays that have the same endpoint. |
acute angle | has a measure between 0˚ and 90˚ |
right angle | has a measure of 90˚ |
obtuse angle | Has a measure between 90˚ and 18˚ |
straight angle | Has a measure of 180˚ |
vertex | common endpoint |
protractor | to measure and draw angles |
degrees | What angles are measured in |
polygon | closed plane figure made up of line segments |
regular polygon | sides of equal length and angles of equal measure |
triangle | 3 sides ∆ |
quadrilateral | 4 sides |
pentagon | 5 sides |
hexagon | 6 sides |
octagon | 8 sides |
equilateral triangle | all sides are the same length |
isosceles triangle | Two sides are the same length |
scalene triangle | No sides are the same length |
right triangle | One angle is a right angle |
acute triangle | All three angles are acute angles |
obtuse triangle | one angle is an obtuse angle |
parallelogram | both pairs of opposite sides parallel and equal in length |
trapezoid | only one pair of parallel sides |
rectangle | a parallelogram with four right angles |
rhombus | a parallelogram with all sides the same length |
square | a rectangle with all ides the same length |
generalization | general statement |