30 cm
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Perimeter = 6*10 = 60 cm
The perimeter is 20*sqrt(2) cm = 28.2843 cm
Diameter is "through", not "around". To find the perimeter ("around"), add the length of the six sides.
what is the perimeter of a 11cm x 10cm rectangle answer 42
10cm is a length. You can only find perimeter (length all the way round) if there is a shape!