math formula memorize

• area of a square = bxh
• area of a triangle = 1/2bxh
• area of a trapezium 1/2(a+b)h
• area of a circle =π (r)^2
• Surface area of a cube =6a^2
• area of a sector = (0/360)π(r)^2
• Curved surface area of a cylinder = 2πrh
• perimeter of a sector = (0/360)2πr
• perimeter of a circle = 2πr
• area of a circle = πr^2
• surface area of a cylinder = 4πr^2
• surface area of a whole cylinder = 2πrh+2πr^2
• volume of any conical shape = 1/3(base area)h
• volume of cube/cuboid = lxbxh
• volume of a cylinder = πr^2h
• area of cone = πrl
• area of a sphere = 4/3πr^3
• area of semi-circle = 2/3πr^3
• km/h -> m/s

  divide by 3.6
• m/s -> km/h

  multiply by 3.6
• simple interest I=PRT
• compound interest A=P(1+r%)^t
• increase as a percentage (Final amount - Initial amount/Initial amount) x 100
• decrease as a percentage (Initial Amount-Final Amount/Initial Amount)x100
• x as a percentage of y (x/y)x100
• a^-n = 1/a^n
• a^-1 = 1/a
• a^-2 = 1/a^2
• (a/b)^-1 =(b/a)
• (a/b)^-2 = (b/a)^2
• m^1/2 = 2^√m
• x^a/b = ^b√x^a
• 1ml = cm^3
• 1 litre = 1000 cm^3
• 1000 liters = 1 m^3
• d = m/v
• sum of all angles in a polygon = (num of sides-2)x180
• sum of all exterior angles are 360