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1-110.

If no sides of a triangle have the same length, the triangle is called scalene (pronounced SCALE-een). And, as you might remember, if the triangle has two sides that are the same length, the triangle is called isosceles. Use the markings in each diagram below to decide if is isosceles or scalene. Assume the diagrams are not drawn to scale.  

Sides with the same markings mean the lengths are the same.

  1. Isosceles

  1. Scalene

  1. is a square

    Isosceles