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Is it possible to construct a triangle with side lengths of 11 cm, 15 cm, and 21 cm? Why or why not?

User Yodama
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Since all of the sums are greater than the third side, it is possible to make a triangle with these three sides.
User Khawarizmi
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There is only one requirement for three sides in order to be considered possible in constructing a triangle. That requirement is
The sum of any of the two sides must be greater than the third side

11 + 15 = 26 > 21
11+ 21 = 33 > 15
15 + 21 = 16 > 11

Since all of the combination fulfill the requirement, yes we could create the triangle with those sides.
User Dgn
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