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# Geometry

### Lines and Angles

TermDefinition
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.
Created by: hollydolly21