Download Polygons наA Closed figure with at least three sides TriangleнаHas

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Polygons ­ A Closed figure with at least three sides Triangle­ Has three sides. Its interior angles measure 180 Degrees Acute Triangle
All angles less than 90
Right Triangle
One 90 degree angle
Obtuse Triangle
One angle is greater than 90
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Types of Triangles Equilateral­ All Three Sides are congruent
Isosceles­ Two sides are congruent
Scalene­ NO sides are congruent 2
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Quadrilateral­ Polygon with four sides
Trapezoid
One pair of parallel lines Square
All four sides and angles are the same Parallelogram
Both pairs of lines are parallel
Rectangle
Four 90 degree angles
Rhombus­ Four congruent sides
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Classifying Polygons
5 Sides = Pentagon
6 Sides = Hexagon
7 Sides = Heptagon
8 Sides = Octagon 9 Sides = Nonagon
10 Sides = Decagon Regular Polygon:
All sides and angles are congruent 4
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