section 4 shape and area

symmetry
1. see page 55
properties of 2D shapes
1. equilateral triangles
  1. 3 sides
  2. 3 equal angles of 60
  3. 3 lines of symetry
  4. rotational symetry order 3
2. right angle triangle
  1. 1 right angle 90
  2. no rotaton
  3. no lines of symetry
3. isosceles triangle
  1. 2 sides the same
  2. 2 same angles
  3. 1 line of symetry
  4. no rotational symetry
4. scalene triangle
  1. 3 diff sides
  2. all diff angles
  3. no symetry
5. square
  1. 4 angles 90
  2. 4 lines symetry
  3. rotational symetry order 4
6. rombus
  1. 4 equal sides
  2. 2 pair of equal angles
  3. 2 lines of symetry
  4. rotational order 2
7. trapezium
  1. 1 pair of parellel sides
  2. no symetry
congruent
1. congruent is 2 shapes that are the same
similar
1. the same shape but different size
perimeters
1. to find the perimeters you add the lengths of all the sides
perimeter algbra see page 36-37 and page 60
area formula
1. rectangle
  1. length x width
2. triangle
  1. half x base x height
3. paralleogram
  1. base x height
4. trapezium
  1. half x bottom + top x height
area of complicated shapes
1. first split them in to rectangles and triangles
2. work out there area seperate
3. add them together
4. example page 62
5. harder example 63
circles
1. circle parts look at page 64 and use class book
2. circle area and circuferance
  1. page 64-65
volume
1. cuboid
  1. length x width x height
2. trianglular prism
  1. area x length
3. cylinder
  1. area of circle x height
nets surface area page 67-68

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	Criado por scottb092 mais de 11 anos atrás