Question

What is an isosceles triangle

Answer 1

Two sides are of the same length.

Answer 2

Two sides are the same length, while one side is not. Most look somewhat like this:

Answer 3

having two sides of equal length.

Answer 4

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Answer 5

Also,

Right triangle: One angle is 90 degrees.
Isosceles: Two sides are the same length, and one is not.
Scalene: No sides or angles are equal.
Equilateral: All sides and angles are equal.

Answer 6

Two sides of the triangle are equal in length. The other side is different.