Question

How many non-congruent triangles with perimeter 7 have integer side lengths?

Answer 1

triangle have not equall side 7+7+7=21 total perimeter length is 21

Answer 2

Answer:

Step-by-step explanation:

By listing all of the integer triples that add up to 7 I get:

{1 1 5}, {1 2 4}, {1 3 3}, and {2 2 3},

We know that the sum of any two side is greater than the third side of a triangle. so we can easily eliminate {1 1 5}, and {1 2 4}.

So, we can say by {1 3 3}, and {2 2 3}  integer side lengths we can construct non-congruent triangles with perimeter 7.