Square: Perimeter = 4s Area = s^{2} 

Rectangle: Perimeter = 2 (l + w) Area = l (x) w 

Triangle: Perimeter = a + b + c Area = 1/2 x b x h Sum of all the angles in a triangle = 180° 
Right angled triangle 
Right angle Hypotenuse theorem a² + b² = c² Area = ^{ 1}⁄_{2} ab Here a is the base and b is the height 
Isosceles triangle 

Equilateral triangle 

Scalene triangle (No sides are equal) 

Rectangular solid: Volume = l x w x h Surface Area = 2 ( lw + wh + lh) Cone: Volume = ^{π}⁄_{3} r² h Surface Area = π r 

Sphere: Volume = 4/3 πr³ Surface Area = 4πr² 