A polygon
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A triangle is a geometric shape.
Any polygonal shape, other than a triangle can have perpendicular lines.
what shape is not a triangle but has 3 sides
A triangle is the 2D name of a certain shape. A triangle has three sides and, in the case of a right angled triangle, has an angle of 90 degrees in one corner. There are many other names depending on the angles used.
Their base shape. For example a rectangular prism has base that is a rectangle. Guess what kind of base shape a triangular prism has? yes, triangle.