A triangle may or may not be a regular polygon. Let's look into things.
First, a triangle is a polygon. All triangles are polygons. To be a regular polygon, the polygon must have equal sides. If the triangle has sides of equal length, then that triangle is an equilateral triangle and a regular polygon. If the triangle doesn't have sides of equal length, then it isn't a regular polygon. But in any case, the triangle is a polygon.
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A triangle in general is just a polygon. An equilateral triangle is a regular polygon.
A triangle (not traingle) is a polygon. It can be a regular polygon but need not be.
equilateral triangle
A regular polygon is one which has all equal sides. But in an isosceles triangle, only 2 sides are equal. The third side has a different measure.Thus an isosceles acute triangle is not a regular polygon.
No, a scalene triangle, for example, is a convex poygon but it is not regular.