Oh, what a lovely question! Let's see here. First, we need to convert 4 meters to centimeters, which gives us 400 cm. Then, we divide 400 cm by 8 cm (the length of each string) to find that you can cut 50 strings from a 4m length. Just imagine all the beautiful creations you can make with those strings!
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You are supposed to divide 4 meters / 30 centimeters. 4 meters is the same as 400 centimeters. In this case, the answer will not be an integer; round it down to the nearest integer.
Perimeter = 2*(4m + 85cm) = 2*4.85 m = 9.7 m
5m,4m,3m respectively
There is no equivalence. A linear metre is a measure of length in 1-Dimensional space, whereas 4m*4m is a measure of area in 2-D space. The two measure different things and, according to the basic principles of dimensional analysis, conversion from one to the other is not valid.
Normally it is simply the length - so 16.5 metres.