Geometry Review Sheet printable pdf download

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◦

Geometry Review Sheet