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Q: If only you have two lengths give examples to find the third lenght of a triangle?

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No. The sum of any two lengths must be greater than the third length.

An isosceles triangle must have two sides of equal size.Since you have a side of 7 and 5, for it to be isosceles, your third side must be either 7 or 5.

The sum of the lengths of two sides of a triangle must be greater than the length of the third so the following eight triangles will do: (1,8,8), (2,7,8), (3,6,8), (3,7,7), (4,5,8), (4,6,7), (5,5,7) and (5,6,6).

If the lengths of each pair of them add to more than the length of the third, they can form a triangle. If not, they cannot.

The sum of the lengths of any two sides of a triangle must be greater than the third. After that, any relationship is specific to the triangle: its angles or other characteristics.

Related questions

If any of its 2 sides is not greater than its third in length then a triangle can't be formed.

The length of the third side of an equilateral triangle is the same as the lengths of both of the other two sides.

18

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0.64

No. The sum of any two lengths must be greater than the third length.

There are not any following lengths in the question to compare. Using the sizes given, and Pythagorean Theorem, the Hypotenuse of the triangle is 36.76 - which will have to do!

Assuming that 15 and 12.5 units are measures of the lengths of two sides of the triangle, the third is any value in (2.5, 27.5) units

It says the sum of the lengths of any 2 sides of a triangle must be greater than the third side. Not equal to but GREATER than the third side.

Greater than the third side

An isosceles triangle must have two sides of equal size.Since you have a side of 7 and 5, for it to be isosceles, your third side must be either 7 or 5.