It depends on what information you do have about the triangle.
There are different equations depending on whether you know the lengths of three sides, the lengths of two sides and the measure of the included angle, the length of one side and the perpendicular distance to the other vertex (base and height).
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1 square metre = 10.7639104 square foot
They are: 1 square meter = 1*1 = 12 meters and 1 cube meter = 1*1*1 = 13 meters
Conversion: cm2 x 0.0001 = square meters
6metres x 8metres = 48 square metres
multiply the width by the breadth