-- it's a closed, plane figure
-- it has 3 sides, 3 vertices, 3 interior angles (any one of these 3 statements implies the other 2)
-- the sum of its interior angles is 180 degrees
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* All sides are different lengths *
They are all polygons having their own particular properties
All isosceles triangles: - Have angles that add up to 180 degrees - Have two equal sides. The unequal side is called the base. - Have equal base angles. - Have areas and perimeters that can be found using the formulas Area=1/2 X (base X height) and Perimeter=side+side+side An equilateral triangle with a right angle is called a right isosceles triangle. Also, all equilateral triangles are isoceles triangles, but not all isosceles triangles are right triangles.
All isosceles triangles are not equilateral triangles
Triangles may be right triangles equilateral triangles acute or obtuse triangles