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Slide 2

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Calculating the Area and Perimeter
of a Square.
5cm
Perimeter:
4l (l= length)...
4 x 5cm = 20cm
Area:
L2 ... 52 = 25cm2
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Slide 3

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Calculating the Area and Perimeter
of a Rectangle.
Perimeter:
2b+2h (b= base, h= height)
2cm
(2x6)+(2x2) = 16cm
6cm
Area:
bh (b x h) ... 2x6 = 12cm2
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Slide 4

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Calculating the Area and Perimeter
of a Triangle.
Perimeter:
a+b+c (see diagram)
5+6+5= 16cm
(a)
5cm
5cm
(c)
Area: (b=base, h=height)
6cm (b)
bh/2... 6x15 / 2 = 45cm2
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Slide 5

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Calculating the Area and Perimeter of a
Trapezium.
Area:
(PopPerimeter:
goes the weasel)...
4cm (d)
1. a+b+c+d
Add together(the
see diagram
parallel )
sides (b+d)
5.5
2. Times the distance between them (e)
(a)
cm
3. 5+6+5.5+4= 20.5cm
5cm
(c)
Divide by two and what do you
6cm (b)
have? The area of a trapezium!
Click for Area...
2
(6cm+4cm)/2 = 5cm
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Slide 6

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Calculating the Area and Perimeter of a
Circle.
6cm (diameter)
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Comments

daviesg


A good presentation of the formulae for area and perimeter of all the basic shapes.  Useful for up to grade C.

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