An isosceles triangle is a triangle where two of its sides are equal, and hence two of its angles (often called "base angles") are equal. You can think of it as an equilateral triangle with one of its sides shortened or lengthened.
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An isosceles triangle (180*) - two sides are the same length.
180 degrees
"Isosceles" is a type of triangle. Triangles are two-dimensional.
quadrilateral
No, they cannot.