1.
Circle

Circle Formula
Area (A) = p × R^{2}
Circumference (C) = 2 × p × R =
p × D
Diameter (D) = 2 × R


2.
SemiCircle

SemiCircle Formula
Area (A) = ^{1}/_{2} × p × R^{2}
Circumference (C) = p × R =
p × ^{D}/_{2}
Perimeter (P) = p × R + 2 × R
Diameter (D) = 2 × R



3.
RegularHexagon

Regular Hexagon
Perimeter (P) = 6 a
Area (A) = ^{Ö3}/_{4}
× 6 × a^{2}


4.
Square

Square
Diagonal (d) = a Ö2
Perimeter (P) = 4a
Area (A) = a^{2} = ^{1}/_{2} d^{2}



5.
Rectangle

Rectangle
Diagonal (d) = ÖL^{2} + B^{2}
Perimeter (P) = 2(L+B)
Area (A) = L × B


6.
Parallelogram

Parallelogram
Area (A) = ah
Perimeter (P) = 2a + 2b



7.
Rhombus

Rhombus
Radius (R_{1}) = ^{D1}/_{2}
Radius (R_{2}) = ^{D2}/_{2}
Side (a) = ÖR_{1}^{2} + R_{1}^{2}
Perimeter (P) = 4 × A
Area (SA) = ^{(D1 × D2)}/_{2}


8.
Trapezium

Trapezium
Area (A) = ^{1}/_{2} h(a + b)
Perimeter (P) = a + b + c + d



9.
Scalene Triangle

Scalene_Triangle
Perimeter (P) = a+b+c
S = ^{P}/_{2} = ^{(a+b+c)}/_{2}
Area (A) = ÖS (S  a) (S  b) (S  c)


10.
Rightangle Triangle

Rightangle_Triangle
Diagonal (c) = Öa^{2} + b^{2}
Perimeter (P) = a+b+c
Area (A) = ^{a × b}/_{2}




12.
Isoceles Triangle

Isoceles_Triangle
Height (H) = ^{Öa2  b2}/_{4}
Perimeter (P) = 2 × a+b
Area (A) = b × ^{H} / _{2}




