Download Geometry Review Sheet Polygon

Geometry Review Sheet
Polygon – a closed 2-D shape with straight sides
3-sided – triangle
4-sided – quadrilateral
5-sided – pentagon
6-sided – hexagon
7-sided – heptagon
8-sided – octagon
9-sided – nonagon
10-sided – decagon
Regular polygons – all sides are equal and all angles are equal
Quadrilaterals:
Parallelogram – a 4-sided two-dimensional shape, where each pair of opposite sides are
parallel
Rectangle – a 4-sided shape with opposite sides that are parallel and it has 4 right angles
Rhombus – a 4-sided shape with opposite sides that are parallel and all sides are equal in
length
Square – a 4-sided shape with opposite sides that are parallel, all sides are equal in
length, and it has 4 right angles
Trapezoid – a 4-sided shape that has 1 pair of parallel sides
Kite – a 4-sided shape with 2 pairs of adjacent sides of equal length
Triangles:
Classified by side length
Scalene – all sides are a different length
Isosceles – 2 sides are equal in length
Equilateral – 3 sides are equal in length
Classified by angle
Right – 1 right angle in the triangle
Obtuse – 1 obtuse angle in the triangle
Acute – All angles are acute
Angles:
Acute – less than 90◦
Obtuse – greater than 90◦
Right – equal to 90◦
Straight – equal to 180◦