Term | Definition |
Line | a long, narrow mark or band |
Line segment | a line that is bounded by two distinct end points |
Ray | A line that starts at a point and goes off in a particular direction to infinity |
Right Angle | an angle measuring 90 degrees |
Acute Angle | an angle measuring less than 90 degrees |
Obtuse Angle | an angle measuring greater than 90 degrees |
Perpendicular Lines | Lines that intersect to make a right angle |
Parallel Lines | Two lines that are always the same distance apart and never touch |
Right Triangle | A triangle with exactly one right angle |
Equilateral Triangle | A triangle with all 3 interior angles measuring 60 degrees |
Line of Symmetry | a line across the figure such that the figure can be folded along the line into mirroring parts |
Adjacent | having a common vertex or side |
Congruent | equal |
Protractor | an instrument for measuring angles |
End point | a point or value that marks the end of a ray or one of the ends of a line segment or interval |
Square | A plane figure with two sets of parallel sides, that are all congruent, and four right angles |
Rectangle | A plane figure with two sets of parallel sides whose adjacent sides are not congruent and all right angles. |
Kite | A plane figure whose two sets of congruent sides are adjacent to each other |
Triangle | a plane figure with three straight sides and three angles |
Rhombus | a plane figure with four congruent sides, one set of congruent obtuse angles, and one set of congruent acute angles. |