Three sides of equal length and thus all angles are each 60 degrees, because all triangles add up to 180 degrees
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Equilateral triangles all have the same sides.
It is an equilateral triangle
No, an equilateral triangle can not be an obtuse triangle. All angles in an equilateral triangle are 60o. An obtuse triangle has 1 angle that is greater than 90o.
You look at the lengths of the sided of the triangle. If the two lengths are same, the triangle is an isosceles triangle. If all the lengths are same, the triangle is an equilateral triangle. If none of the lengths are same, the triangle is a scalene triangle.
a plane triangle is a normal triangle, like the isosceles, right angled, equilateral and scalene triangle.
Any isosceles triangle which is not also an equilateral triangle. An equilateral triangle would have three.