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## Answers

Area = ½ × b × h

b = base

h = vertical height Square

Area = a2

a = length of sideRectangle

Area = w × h

w = width

h = height Parallelogram

Area = b × h

b = base

h = vertical heightTrapezoid (US)

Trapezium (UK)

Area = ½(a+b) × h

h = vertical height Circle

Area = π × r2

Circumference = 2 × π × r

r = radiusEllipse

Area = πab

Sector

Area = ½ × r2 × θ

r = radius

θ = angle in radiansNote: h is at right angles to b:

Example: What is the area of this rectangle?The formula is:Area = w × h

w = width

h = heightWe know w = 5 and h = 3, so:Area = 5 × 3 = 15

Square

Side= 5 cm

A square= SxS

A square= 5cm x 5cm

A square= 25cm raise to 2

Side= 5 cm

A square= SxS

A square= 5cm x 5cm

A square= 25cm raise to 2