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Because all of the lengths of the sides are equal. It also works vice versa.

Q: Why does an equilateral triangle have equal angles?

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That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.

An equilateral triangle has 3 equal sides and 3 equal angles of 60 degrees.

An equilateral triangle has 3 equal sides and 3 equal angles of 60 degrees.

There are three measurable angles within a triangle, and within a equilateral triangle there are thee equal angles, each measuring 60o .

An equilateral triangle has three sides that are equal in length and three angles that are equal.

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That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.That is called an equilateral triangle. An equilateral (equal sides) triangle is also equiangular (equal angles), so it follows that all angles are 60 degrees.

An equilateral triangle has 3 equal sides and 3 equal angles of 60 degrees.

An equilateral triangle has 3 equal sides and 3 equal angles of 60 degrees.

A triangle with three equal angles is an equilateral triangle.

There are three measurable angles within a triangle, and within a equilateral triangle there are thee equal angles, each measuring 60o .

An equilateral triangle has three sides that are equal in length and three angles that are equal.

An equilateral triangle has 3 equal acute angles of 60 degrees.

An equilateral triangle has 3 equal angles each measuring 60Â°An equilateral triangle for example has 3 equal angles of 60 degrees that add up to 180 degrees.

An equilateral triangle

An equilateral triangle

There are exactly 3 equal angles (of 60o) and three equal sides in any equilateral triangle.

A triangle in which all angles are equal is an equiangular triangle. In the case of a triangle, being equiangular also implies that it is equilateral and the more common common name for such a triangle is an equilateral triangle.