Shapes Geometry Reference Sheet
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Common Polygons
triangle
quadrilateral
pentagon
hexagon
octagon
3 sides
4 sides
5 sides
6 sides
8 sides
Quadrilaterals That Have Special Names
A rectangle has opposite
A square has four sides
A trapezoid has only one
sides parallel and four
of the same length and
pair of parallel side.
right angles.
four right angles.
A parallelogram has opposite sides
A rhombus has opposite sides
parallel and of the same length.
parallel and four sides of the
same length.
Different Ways to Classify Triangles
You can classify triangles by the lengths of their sides.
Equilateral Triangle
Isosceles Triangle
Scalene Triangle
All sides are
At least two sides are
No sides are
the same length.
the same length.
the same length.
You can classify triangles by the sizes of their angles.
Obtuse Triangle
Acute Triangle
Right Triangle
One angle is
All angles
One angle is
an obtuse angle.
are acute angles.
a right angle.
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