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Classify 2D figures
polygons, quadrilaterals, triangles
Term | Definition |
---|---|
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 |