3 cm = 1.181 inch (rounded)
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what is the perimeter and area of a rectangle 3cm long and 3cm wide
It is likely that the shape you have in mind is a cube, with each edge being 3 cm long.
16cm.
Well, honey, if we're talking about a square with sides that are all 3cm long, then each side is, surprise surprise, 3cm in length. It's a square, not a triangle – all sides are equal. So, grab a ruler, measure it out, and you'll see that each side is indeed 3cm.
it is about 5cm long and 3cm wide