You can convert each of these numbers to inches, dividing by 2.54.
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Area : 44cm² Perimeter : 30cm
To calculate the perimeter of a rectangle, you need to add together the length of each side of the rectangle. For a rectangle that is 11cm x 4cm, you would add these numbers together, then multiply it by 2 (this is because there are two sides that are 11cm and two sides that are 4cm). Thus: (11+4) x 2 = 30cm.
The ball used in table tennis has a diameter of d = 40 mm. Some time ago it was 38 mm. 40mm=4cm, 4cm/(2.54cm/in)=1.575 (rounded) inches
1cm = 10mm, so 4cm = 40mm. 1m = 100cm or 1000mm.
It is an equilateral triangle