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# Geometry terms

### Vocab words on geometry

TermDefinition
Geometry The study of points lines angles surfaces and solids ?
Point A location in space represented by a dot?
Line A collection of points that extend forever in same direction?
Line segment A part of a line that has 2 end points ?
Ray A collection of points that begin at one point and extend forever ?
Angle 2 rays with the same end point ?
Vertex The point where 2 points meet?
Plane A flat surface that extends forever in all directions ?
Parallel lines Lines that are always same distance apart and will never cross each other?
Intersecting lines Lines that cross each other in the same spot ?
Perpendicular lines Intersecting lines that cross and make a right angle 90 degrees ?
Acute angle A angle less than 90 degrees ?
Right angle A perfect 90 degree angle ?
Obtuse angle A angle that is greater then 90 but less then 180 degrees ?
Straight A line that is flat 180 degrees?
Reflex angel A angle that is between 180 and 360 degrees ?
Supplementary lines 2 angles that equal to 180 degrees?
Complementary lines 2 angles that equal to 90 degrees
Polygon A closed plane figure with 3 or more sides triangle?
Triangle A polygon with 3 sides?
Right triangle A triangle with one 90 degree angle?
Obtuse triangle A triangle that has one angle that is bigger than 90?
Acute triangle All angles are less then 90 degrees
Scalene triangle A triangle with no equal sides?
Isosceles triangle A triangle with 2 equal sides ?
Equilateral triangle A triangle with all equal sides
Quadrilateral A polygon with 4 sides?
Square A polygon with 4 equal sides and 4 right angles?
Rectangle A 4 sided polygon with 4 right angles and 2 opposite angles are Equal?
Rhombus A polygon with 4 equal sides and opposite angles are equal?
Parallelogram A 4 sided polygon with 2 equal and parallel sides?
Trapezoid A 4 sided polygon with one pair of parallel sides and one pair of Sides that are not parallel ?
Area Number of square units needed to cover a region
Perimeter The add up,of all sides around a shape
Area of square Base x height
Area of rectangle B x h
Area of triangle 1/2 x b x h
Area of Parallelogram A = b x h
Area of trapezoid 1/2 x h ( b1 + b2 )
Altitude Another word for height
Created by: 401512