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Measuring Area

A = area, a = top, b = base, h = height, l = length, = Pi (3.1416), r = radius
Square | Rectangle | Parallelogram | Triangle | Trapezium | Circle

Measuring the Area of a Square
• Square
Plane rectilinear figure with four equal sides and four right angles. The first two calculations are so easy even I can do them.
To calculate the area of a square simply multiply the base (b) by the height (h) as

A = bh

Measuring the Area of a Rectangle
• Rectangle
Plane rectilinear four sided figure with four right angles. As the square, just multiply the length (b) of the base by the height (h).

A = bh

Measuring the Area of a Parallelogram
• Parallelogram
Plane rectilinear four sided figure whose opposite sides are parallel. The parallelogram is similar to the rectangle but you should remember that the height is not the perpendicular distance from the top to the base but the length of the upright line.

A = bh

Measuring the Area of a Triangle
• Triangle
Plane rectilinear figure with three sides and three angles. Finding the area of this one looks difficult but is really not.
Measure the perpendicular distance from the apex to the base (h), multiply this by the base (b) and divide by two. Easy peasy.

 A= bh 2

Measuring the Area of a Trapezium
• Trapezium
A quadrilateral with its base and opposing side parallel. Getting harder?
Not really: Measure the perpendicular distance from the top to the base to gain the height.
Add together the lengths of the base (b) and the top (a) then multiply the sum by the height  (h) and divide the result by 2

 A= (a + b)h 2

Measuring the Area of a Circle
• Circle
A plane figure with its circumference everywhere being equidistant from the centre. To measure the area of a circle you should multiply the radius (r) by itself then multiply the result by Pi (3.1416) : The equation is

Area = Pi X Radius squared

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