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# Math Vocabulary

### Chapter 19, Part 2

intersecting lines lines that cross each other at exactly one point
parallel lines lines in the same plane that never intersect and are always the same distance apart
perpendicular lines two lines that intersect to form four right angles
polygon a closed plane figure formed by three or more straight sides that are line segments
triangle a polygon with three sides and three angles
quadrilateral a polygon with four sides and four angles
pentagon a polygon with five sides and five angles
hexagon a polygon with six sides and six angles
octagon a polygon with eight sides and eight angles
decagon a polygon with ten sides and ten angles
regular polygon a polygon that has sides that are the same length
parallelogram a quadrilateral whose opposite sides are parallel and equal, or congruent
rhombus a parallelogram with four equal, or congruent sides
trapezoid a quadrilateral with exactly one pair of parallel sides
equilateral triangle a triangle with three equal sides
isosceles triangle a triangle with two equal sides
scalene triangle a triangle with no equal sides
right triangle a triangle with one right angle
acute triangle a triangle with three acute angles
obtuse triangle a triangle with one obtuse angle
Created by: RossCoops3