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Taylor's Math

Shapes and Designs Vocabulary Words Study Guide

Vocabulary WordDefinition
triangle three sides
quadrilateral four sides
pentagon five sides
hexagon six angles and six sides
heptagon seven sides
octagon eight sides
nonagon nine sides
decagon ten sides
equilateral triangle triangle with all equal sides
straight angle an angle with 180°
degrees a unit of measurement
right angle an angle of 90°
ray a line from a point that goes on forever in one direction from that point
acute angle an angle of less than 90°
vertex the intersection of two sides of a plane figure to form an angle
isosceles triangle a triangle with two equal sides
obtuse angle an angle greater than 90° but less than 180°
scalene triangle a triangle with no equal sides
parallelogram a quadrilateral having both pairs of opposite sides parallel to each other
rotation symmetry when you rotate (or turn) a figure around a center point by fewer than 360°
reflection symmetry two halves that are mirror-images of each other
regular polygon a polygon which all angles are congruent and all sides have the same length
irregular polygon have sides of differing lengths and angles of differing measure
parallel lines are lines that never intersect
transversal a line that passes through two or more lines
tiling laying down shapes in a pattern
square a rectangle having all four sides of equal length
rectangle A parallelogram with four right angles.
line a straight figure that is 180° and goes on forever
dodecagon 12 sides
line segment a line that has two end points
Created by: Momof4