section 4 shape and area

section 4 shape and area

1. symmetry

   • see page 55

2. properties of 2D shapes

   • equilateral triangles
     • 3 sides
     • 3 equal angles of 60
     • 3 lines of symetry
     • rotational symetry order 3
   • right angle triangle
     • 1 right angle 90
     • no rotaton
     • no lines of symetry
   • isosceles triangle
     • 2 sides the same
     • 2 same angles
     • 1 line of symetry
     • no rotational symetry
   • scalene triangle
     • 3 diff sides
     • all diff angles
     • no symetry
   • square
     • 4 angles 90
     • 4 lines symetry
     • rotational symetry order 4
   • rombus
     • 4 equal sides
     • 2 pair of equal angles
     • 2 lines of symetry
     • rotational order 2
   • trapezium
     • 1 pair of parellel sides
     • no symetry

3. congruent

   • congruent is 2 shapes that are the same

4. similar

   • the same shape but different size

5. perimeters

   • to find the perimeters you add the lengths of all the sides

6. perimeter algbra see page 36-37 and page 60

7. area formula

   • rectangle
     • length x width
   • triangle
     • half x base x height
   • paralleogram
     • base x height
   • trapezium
     • half x bottom + top x height

8. area of complicated shapes

   • first split them in to rectangles and triangles
   • work out there area seperate
   • add them together
   • example page 62
   • harder example 63

9. circles

   • circle parts look at page 64 and use class book
   • circle area and circuferance
     • page 64-65

10. volume

    • cuboid
      • length x width x height
    • trianglular prism
      • area x length
    • cylinder
      • area of circle x height

11. nets surface area page 67-68