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Glossary of 2-D Figures

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Right Isosceles Triangle
A triangle with one right angle and two congruent angles.
Right Scalene Triangle
A triangle with one right angle and no congruent angles.
Equilateral Triangle
A triangle with 3 congruent angles and three equal sides
Isosceles Triangle
A triangle with two congruent angles and two equal sides.
Scalene Triangle
A triangle with no congruent angles and three unequal sides
Triangle
A polygon with three angles, three vertices and three sides
Quadrilaterals
a polygon with four sides, four vertices and four angles.
Parallelogram
a quadrilateral with two sets of parallel lines
Trapezoid
A quadrilateral with one set of parallel lines.
Square
A rectangle with 4 equal sides, 4 vertices and 4 right angles.
Rectangle
a quadrilateral with 4 sides, 4 vertices and 4 right angles.
Kite
a quadrilateral with two equal adjacent sides.
Rhombus
A quadrilateral with four equal sides and angles.
Pentagon
a polygon with 5 sides, 5 vertices and 5 angles.
Hexagon
a polygon with 6 sides, 6 vertices, 6 angles.
Heptagon
a polygon with 7 sides, angles and vertices.
Octagon
a polygon with 8 sides and 8 angles
Nonagon
a polygon with 9 sides and 9 angles
Decagon
A polygon with 10 sides and 10 angles
Circle
a closed figure whose sides are equidistant from the center.

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