That's an isosceles triangle.
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It is an isosceles triangle when two of its three sides are of the same length.
All triangles have three sides. An isosceles triangle has two sides which are the same length and an equilateral triangle has all three sides of the same length.
A three-sided polygon is called a triangle. If two of the sides are of the same length, it is said to be an isosceles triangle.
An EQUILATERAL triangle has all three sides the same length. An ISOSCELES triangle has two sides with the same length. A SCALENE triangle has all three sides different lengths.
Triangles are congruent when:All three sides are the same length (SSS congruency)Two sides and the angle between them are the same length (SAS congruency)Two angles and the side between them are the same length (ASA congruency)