Geometry flashcards 11/18
Ray
Has 1 endpoint
Line
Has no endpoints
Segment
2 endpoints
Angle
2 rays with a common endpoint
Congruent
Same size and same shape
Acute angle
Measures less than 90°
Right angle
Measures 90°
Obtuse angle
Measures between 90° and 180°
Complimentary
Angle that adds up to 90°
Supplementary angles
Angles that add up to 180°
Parallel lines
Lines that never cross
Perpendicular lines
Lines that intersect and form 4 right angles
Polygon
A simple closed figure who’s sides are segments
Equilateral triangle
A triangle w/ three congruent sides
Isosceles triangle
A triangle w/ at least two congruent sides
Scalene triangle
A triangle with congruent sides
Quadrilateral
A four-sided figure
Trapezoid
A quad with a pair of paralleled sides
Parallelogram
A quad with opposite parallel sides
Rectangle
A quad with opposite sides parallel (and congruent) and four right angles
Rhombus
A quad with opposite sides parallel tall sides congruent
Square
A quad with opposite sides parallel, 4 right angles, and all sides congruent
Pentagon
Five sided figure
Hexagon
6 sided figure
Septagon
A 7 sided figure
Octagon
An 8 sided figure
Decagon
A 10 sided figure
