That fragment absolutely does not ring any bell, but is already long enough to
distinctly appear to be headed off in the wrong direction.
My only guess as to a source would be Peter Griffin after several too many.
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The word "isosceles" comes from Greek roots and means "equal leg." An isosceles triangle has two sides of equal length.
An equilateral triangle is a triangle with three equal sides. An isosceles triangle is one with two equal sides. So yes, an equilateral triangle qualifies as being an isosceles triangle as well. This is quite similar to the relationship between squares and rectangles, where a square is always a rectangle, but a rectangle isn't necessarily a square.
An isosceles triangle has to have two sides of equal length. An isosceles triangle has to have two sides of equal length.
An isosceles triangle has two equal sides.
An isosceles triangle is a triangle that has at least 2 sides that are congruent.More simply put, an isosceles triangle has two sides of equal length (and therefore two equal angles opposite those equal sides)