Area and Perimeter Formulas

Triangle

Equilateral Triangle Isosceles Triangle Scalene Triangle
Perimeter of an Equilateral Triangle Perimeter of an Isosceles Triangle Perimeter of a Scalene Triangle
Equilateral Triangle Isosceles Triangle Scalene Triangle
Area of Triangle

Formula for Area of a Triangle

Square

Square

Perimeter of a Square Formula

Area of a Square Formula

Rectangle

Rectangle

Perimeter of a Rectangle Formula

Area of a Rectangle Formula

Rhombus

Rhombus

Rhombus Formula

Area of a Rhombus Formula

Rhomboid

Rhomboid

P = 2 · (a + b)

A = b · h

Area of Trapezoid

Area of a Trapezoid

Area of a Trapezoid Formula

Area of a Regular Polygon

Area of a Regular Polygon

Formula for Area of a Regular Polygon

n is the number of sides

Formula for Area of a Regular Polygon

Polygon

Area of an Irregular Polygon

The area is obtained by triangulating the polygon and adding the area of these triangles.

A = T1 + T2 + T3 + T4

Circle

Circle

Circumference of a Circle Formula

Circumference of a Circle Formula

Area of a Circle Formula


Circular Sector

Circular Sector

Circular Sector Length

Area of a Circular Sector


Circular Segment

Circular Segment

The circular area of the segment AB = Area of the circular sector AOB - Area of triangle AOB


Lune of Hippocrates

Lune of Hippocrates

Area of the lune = area of the semicircle − area of circular segment.

Lune of Hippocrates Formula

 

Circular Trapezoid

Circular Trapezoid

Area of a Circular Trapezoid


Area enclosed between Two Concentric Circles

Area enclosed between Two Concentric Circles

Area enclosed between Two Concentric Circles Formula





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