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Classify 2D figures

polygons, quadrilaterals, triangles

TermDefinition
polygon A closed flat figure with straight lines
quadrilateral a four-sided polygon
hexagon 6 sided polygon
pentagon 5 sided polygon
octagon 8 sided polygon
congruent same size, same shape
Parallelogram A quadrilateral with two pairs of parallel sides
Trapezoid a quadrilateral with only one pair of parallel sides
square 4 equal sides, 4 right angles
parallel lines lines that never meet or intersect
right angle 90 degree angle
acute angle less than 90 degrees
obtuse angle more than 90 degrees
isosceles triangle A triangle that has 2 equal sides.
scalene triangle a triangle with no congruent sides
equilateral triangle a triangle with 3 congruent sides
QPTRRS quadrilateral, parallelogram, trapezoid, rectangle, rhombus, square
Rhombus a parallelogram with 4 congruent sides
Created by: Mrs. Salas 4th
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