Area and Perimeter of Common Shapes

Triangles:

Area given all sides (SSS) - Heron's Formula

Heron of Alexandria:

Rectangles and Squares:

  

Parallelograms:

 

 Trapezoids:

 

Circles:

Polygons

Convex Regular Polygons (n-gons)

• Pentagon – n = 5 sides
• Hexagon – n = 6 sides
• Heptagon – n = 7 sides
• Octagon – n = 8 sides
• Nonagon – n = 9 sides
• Decagon – n = 10 sides

Perimeter and Area

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Radian Measure

Radian Measure Definition:

Use radians for all following formulas. Convert using the following facts.

Arc-Length Formula

Area of a Sector Formula

Circular Motion Formulas

[ Online Converter and Notes ]