Rectangular box
Volume = l w h  
Circle
Area = π r^{2} Circumference = 2 π r  
Cone
 
Cylinder
Volume = π r^{2} h  
Pyramid
 
Rectangle
Area = l w Perimeter = 2 l + 2 w  
Sphere
Surface Area = 4 π r^{2}
 
Triangle
 
Pythagorean Theorem
a^{2} + b^{2} = c^{2}  
Two triangles are similar if corresponding angles are equal.
If △ABC is similar to △A′B′C′, then the ratios of corresponding sides are equal:
