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a plane triangle is a normal triangle, like the isosceles, right angled, equilateral and scalene triangle.
an isosceles triangle has only 2 equal length sides and a scalene triangle has no equally lengthen sides. obviously they are in the shape of a triangle.
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The triangle with angles measuring 50 degrees, 65 degrees, and 65 degrees is an isosceles triangle. In an isosceles triangle, two of the three angles are equal, making it a special type of triangle. In this case, the two angles measuring 65 degrees are equal, indicating that the two sides opposite these angles are also equal in length.