10mm=1cm therefore 90mm=9cm
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Perimeter = 6cm + 6cm + 9cm + 9cm = 30cm
54
It is 3 inches
add 9cm to10cm and you come up with 19cm is ths correct?
ok if the perimeter is 36cm and it is a square then you know all four sides are equal 36cm / 4sides = 9cm for each side A = L * W ( both the length and width are 9cm because each side is equal ) A = 9cm * 9cm A = 81cm2