A triangle having sides of different lengths is called:

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an isosceles triangle

an equilateral triangle

a scalene triangle

a right triangle

answer is C.

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Detailed Solution

Given a triangle with unequal lengths.
An isosceles triangle has two sides of equal length.
An equilateral triangle has all the sides of equal length.
A scalene triangle has all sides of different length.
A right triangle has one angle equal to 90°.
Thus, a triangle that has different lengths is called a scalene triangle.
Therefore, option (3) is correct.

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