A triangle has three sides and three angles.
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A triangle is an object composed of three sides and three angles.
Triangle is plane with three sides and three angles. The sum of its inside angles is equal to 180 degrees.
A plane (flat) shape with three sides is called a "triangle".Notice that if it has three sides, then it must have three angles.
That is the definition of a triangle. If it did not have three sides it would not be a triangle. If it did not have three angles, it would not be a triangle.
No. Triangles have three angles and three sides. A quadrilateral has four angles and four sides.