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Yes, a triangle is a "flat" figure. A triangle is three distinct points connected by line segments, and it takes three points to determine a plane. That translates to the fact that a triangle is a planar figure; it lies on a plane.

An easy way to see this is to take a string and tie the ends to any two points (like two table legs). Then pick up the string in the middle. The two ends and your fingers represent the three points of the triangle. No matter where you move your hand, the triangle will remain a flat figure.

Of course, if you draw a triangle on a sphere or other curved surface, the sides will be arcs, not straight lines.

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Q: Is a triangle a flat figure?
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