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.
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It will have 3 lines of different lengths and is classed as a scalene triangle.
True...
a triangle is not regular
Most people, when asked to draw a triangle, would probably draw an acute or maybe a right triangle.
-- Just go ahead and draw a triangle. Any triangle.-- Did you do it ? Good.-- Your triangle has three angles in it.