shapes

• Perimeter


  The distance around the outside of a shape
• Finding the perimeter of a shape


  Add up all the side lengths
• Parts of a circle

  • Circumference - distance around the circle
  • Diameter - line through the centre
  • Radius - line from centre to edge
  • Tangent - line touching the circle
  • Chord - line between two points on the circle
  • Sector - area between two radii
  • Segment - area between a chord and the circumference
• Finding the area and circumference of a circle

  1. Area = πr^2

  2. Circumference = 2πr
• Finding the area and surface area of a cuboid

  1. Volume = length x width x height

  2. Surface area = 2(lw + lh + wh)
• Finding the volume of a prism

  Volume = area of end face x length
• Finding the volume and surface area of a cylinder

  1. Volume = πr^2h

  2. Surface area = 2πr^2 + 2πrh
• Finding the area of a parallelogram and trapezium

  1. Parallelogram: Area = base x height

  2. Trapezium: Area = 1/2 (a + b)h
• Congruent Shapes


  Shapes that are the same size and shape, but may be in a different position
• Congruent Shapes


  • They are translated, reflected and/or rotated but do not change size
• Interior Angle


  The angle inside a polygon
• Exterior Angle


  The angle outside a polygon