times the width by the length - eg, If an area is 3.5 metres long by 2.5 metres wide the square metreage wil be 8.75 square metres (Which is written 8.75m2)
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Divide the diameter by 2 to get the radius. Then use the formula for the area of a circle (pi x radius2).
Multiply by 144.
Square meters x 10.764 = square feet.
How can you calculate the square root of 1.8E-5 without a calculator?
Square inches x 0.00694 = square feet