draw a square with sides that are 1 metre long.
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1 square metre is the metric unit of measurement for an area. The area may be of any flat shape: a long thin strip, circle, triangle, the inside of a closed wriggly curve. But the total area covered by it must be equal to that of a square whose sides are 1 metre long.
A square centimetre is a measure of area whereas a meter is a measure of length. Dimensional analysis shows that area = [L2] and length = [L]. It is not possible to convert one to another.
A right-angle triangle is half of a square or rectangle. Draw a square or rectangle and draw a line from one corner to the corner diagonally opposite. You now have two triangles of the same area.
1 m^2 = 10000 cm^2.
Squares are rectangles. Draw a 2 unit square.