Q: Is a triangle regular or not regular?

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If by regular, you're referring to a regular polygon which has all sides equal length, and all angles equal, then an equilateral triangle is a regular triangle. If you draw a scalene triangle or an isosceles triangle then it will not be equilateral.

Only when its an equilateral triangle then it is a regular polygon

Equilateral triangle, regular triangle.

Irregular

A radius of a regular triangle is 12 . find the length of one side of the triangle?

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There is no such thing as a regular isosceles triangle. The only regular triangle is an equilateral triangle. Having said that, any triangle will produce regular tessellation.

If by regular, you're referring to a regular polygon which has all sides equal length, and all angles equal, then an equilateral triangle is a regular triangle. If you draw a scalene triangle or an isosceles triangle then it will not be equilateral.

A scalene triangle is irregular. Only an equilateral triangle is regular.

A regular triangle is a equalateral triangle. A regular triangle is one for which all sides are congruent and all interior angles ---- are congruent ---- ---- ---- ----

Only when its an equilateral triangle then it is a regular polygon

A triangle is only a regular triangle in the form of an equilateral triangle

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.

A triangle in general is just a polygon. An equilateral triangle is a regular polygon.

It is the regular triangle whose exterior angles are greater than the regular heptagon

Yes it is

An equilateral triangle

a regular or scalene triangle has no equal sides