The three angles opposite the three equal sides are equal in size because the three sides are equal.
Given,
An equilateral triangle in geometry is a triangle with equally long sides. The three angles opposite the three equal sides are equal in size because the three sides are equal. It is also known as an equiangular triangle since each angle is 60 degrees.
A right-angled triangle has one angle that is 90 degrees, thus if we define an equilateral triangle as having all angles that are 90 degrees, their sum would be 270 degrees, which is not conceivable because the sum of all the angles in a triangle is 180 degrees.
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