Question 1193705
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The length of the sides of a triangle are consecutive whole numbers. If its perimeter is 12cm, what are its dimensions?
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3,  4  and  5.


It is right-angle triangle.   


It is so  FAMOUS,  that practically every student knows it.




To solve formally,  notice that {{{highlight(if)}}} the sum of three consecutive integer numbers is  12, 


{{{highlight(then)}}} the middle integer is one third of the sum,   i.e.    12/3 = 4,    which gives you the same answer.