# 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 r^{2}

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