Perimeter
Perimeter is the distance around a shape, measured in units
Key facts
o Circumference of a circle = 2 x π x r
o Circumference of a circle = 2 x d
(r = radius and d = diameter)
Area
Area is the amount of surface covered by a shape, measured in square units
Key facts
o Area of triangle = ½ x base x vertical height
o Area of rectangle = length x width
o Area of parallelogram = base x vertical height
o Area of trapezium = average of parallel sides x distance between parallel sides
o Area of a circle = π r2
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