maths….

• | angles in polygon

  sum of interior angles= (n-2)x180
• | angles in polygon

  sum of exterior= 360
• | angles in polygon

  int angle + ext angle= 180
• | angles: parallel lines

  • alternate: Z_ equal
  • corresponding: F_ equal
  • co interior: add to 180
  • vertically opposite: equal

  
• speed = distance/time
• density= mass/volume
• | parts of a circle

  
• | circumference

  circumference = pi x diameter
• | perimeter of a semi-circle

  perimeter of semi circ= (pi x d)/2

  • basically circumference but divided by 2..
• | arc length

  arc length= angle/360 x pi x d
• | area of trapezium

  area= 1/2(a+b) x h
• | area of a circle

  area of circle= pi x r^2
• circumference = pi x diameter
• Circumference = pi x diameter
• how do you calculate circumference ?

  pi x diameter
• volume of sphere = 4/3 x pi x r^3
• volume of sphere = 4/3 x pi x r^3
• olume of sphere = 4/3 x pi x r^3
• Volume of cone = 1/3 x pi x r^2 x h
• Circumference = pi x diameter
• area of circle = pi x r^2
• curved SA of cone = pi x r x l
• volume of a cylinder: pi x r^2 x h
• curved SA of cone = pi x r x l
• curved SA of cone = pi x r x l
• volume of a cylinder: pi x r^2 x h
• volume of a cylinder: pi x r^2 x h