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Polygons

QuestionAnswer
polygon A closed shape with straight sides
quadrilateral A polygon with 4 sides and 4 angles
trapezoid A quadrilateral with at least one pair of parallel sides
parallelogram A quadrilateral with two pairs of parallel sides
rectangle A parallelogram with 4 right angles
rhombus A parallelogram with 4 equal (congruent) sides
square A shape with 4 equal sides AND 4 right angles
acute triangle A triangle with all angles less than 90°
right triangle A triangle with one right angle (90°)
obtuse triangle A triangle with one angle greater than 90°
equilateral triangle A triangle with 3 equal sides
isosceles triangle A triangle with 2 equal sides
scalene triangle A triangle with no equal sides
triangles named by angles Acute, Right, Obtuse
triangles named by side lengths Equilateral, Isosceles, Scalene
pentagon a polygon with 5 sides
hexagon a polygon with 6 sides
heptagon a polygon with 7 sides
octagon a polygon with 8 sides
nonagon a polygon with 9 sides
decagon a polygon with 10 sides
why are all squares rectangles? They have 4 right angles
Why are all rectangles NOT squares? They do not all have 4 equal sides
Why is a square a rhombus? It has 4 equal sides
Why is a rectangle a parallelogram? It has two pairs of parallel sides
Created by: user-1704838
 

 



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