# MATHS

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• Created by: India
• Created on: 27-11-12 17:21
• Maths Unit 2 student bk2
• converting measurements
• 10mm = 1cm
• 1000mm = 1m
• 100cm = 1m
• 1000m = 1km
• perimeter = distance all the way around
• NUMBER
• negative and fractional indices
• Shape and space
• Circles
• perimetre   circumference
• 2?r
• Arcs and sectors
• area of sector
• x/360 X  ?r squared
• Arc  Length
• x/360 X  2 X ? X r
• Surface area
• ?r squared
• Solids
• Any solid with parallel sides and a constant cross section is called a PRISM
• Volume of a prism = cross sectional area X height
• A CYLINDER is a prism with a circular cross section
• volume of a cylinder = ?r squared X height
• Curved surface area of a cylinder = 2?rh
• A CONE is a pyramid with a circular base
• volume of a cone = 1/3 X  ?r squared X height
• curved  surface area of a cone =  ?rl (L STANDS FOR SLANT HEIGHT)
• SIMILAR SHAPES AND SOLIDS
• length scale factor = K
• these are only true if they are SIMILAR SHAPES
• area scale factor = k squared
• volume scale factor = k cubed
• area scale factor = k squared
• volume scale factor = k cubed
• probability
• mutually exclusive = P(A) + P(B)
• mutually exclusive = e.g. a light cannot be both off and on.
• independent events = P(A) X P(B)
• independent is when events dont directly effect one another
• READ THE QUESTION, DOES IT SAY REPLACED?