Topic 9 Geometry Flashcards
(36 cards)
Quadrilateral
A polygon with four sides
Triangle
A polygon with three sides
Plane figure/shape
A figure/shape with only two dimensions
Line
A straight path of points that goes on forever in two directions
Point
An exact location in space
Plane
An endless flat surface
Acute angle
An angle that is less than 90 degrees
Obtuse angle
An angle that is more than 90 degrees
Right angle
An angle which measures 90 degrees
Parallel lines
In a plane, lines that never intersect
Perpendicular lines
Two intersecting lines that form right angles (square corners)
Parallelogram
A quadrilateral in which opposite sides are parallel
Pentagon
A plane figure with 5 sides
Acute triangle
A triangle with three acute angles
Angle
A figure formed by two rays that have the same endpoint
Equilateral triangle
A triangle in which all sides are the same length
Hexagon
A polygon with 6 sides
Intersecting lines
Lines that cross at one point
Isosceles triangle
A triangle that has at least two equal sides
Line segment
A part of a line that has two endpoints
Obtuse triangle
A triangle in which there is one obtuse angle
Octagon
A polygon with 8 sides
Polygon
A closed plane figure/shape made up of line segments
Protractor
A tool used to measure and draw angles
