Area and Perimeter of Shapes Tricks and Formulas
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Pythagoras Theorem
For right triangle ABC

Right Triangle ABC
Right Triangle ABC
For acute triangle ABC

Acute Triangle ABC
Acute Triangle ABC
For obtuse triangle ABC

Obtuse Triangle ABC
Obtuse Triangle ABC
Area of Triangle
When Lengths of the Sides Are Given

When Lengths of the Sides Are Given
When lengths of the sides are given
When Lengths of the Base and Altitude Are Given

When Lengths of the Base and Altitude Are Given
When lengths of the base and altitude are given
When Lengths of Two Sides and the Included Angle Are Given

When Lengths of Two Sides and the Included Angle Are Given
When lengths of two sides and the included angle are given
For Equilateral Triangle

Equilateral Triangle
Are of Equilateral Triangle
For Isosceles Triangle

Isosceles Triangle
Area of Isosceles Triangle
Apollos Theorem

Apollus Theorem
Apollus Theorem
If AD is the median, then:
Angle Bisector Theorem

Angle Bisector Theorem
Angle Bisector Theorem
If AD is the angle bisector for angle A, then:
Area of Quadrilateral
For Cyclic Quadrilateral
If Lengths of One Diagonal and Two Offsets Are Given

If Lengths of One Diagonal and Two Offsets Are Given
If lengths of one diagonal and two offsets are given
If Lengths of Two Diagonals and the Included Angle Are Given

If Lengths of Two Diagonals and the Included Angle Are Given
If lengths of two diagonals and the included angle are given
For Trapezium

Trapezium
Area of Trapezium
For Parallelogram

Parallelogram
Area of Parallelogram
For Rhombus

Rhombus
Area of Rhombus
The halves of diagonals and a side of a rhombus form a right angled triangle with side as the hypotenuse.
For Rectangle

Rectangle
Area of Rectangle
Perimeter of a rectangle
For Square

Square
Area of Square
Area of a square
Area of 4 walls of a room
Polygons
Number of Diagonals
The Sum of All the Interior Angles
The Sum of All the Exterior Angles
Area of Regular Hexagon

Regular Hexagon
Area of Regular Hexagon
Area=
Circle

Circle
Area of Circle
Circumference
Area
Length of Arc
Area of Sector
Or
Perimeter of Sector
Ellipse

Ellipse
Area of Ellipse
If semi-major axis and semi-minor axis
Perimeter of the Ellipse