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# Isosceles & Equilateral Triangle

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❶Solving Systems by Substitution and Method of Choice

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Also when all three sides are marked, an equilateral triangle can be drawn one way, noticing that the each of the angles is acute. The key concept here is number congruent sides. The number congruent sides always tell us how many congruent angles we have. In Isosceles triangle if there are two congruent sides then there will be two congruent angles. Where as in equilateral triangle all the three sides are congruent thus will have all three congruent angles. In isosceles triangle where two sides are marked congruent.

Here the base of the side is not congruent to the other two or not equal length of the other two sides. The base angles are congruent for an isosceles triangle.

The congruent sides are always opposite to the congruent angles in isosceles triangle. For equilateral triangles, the angles are opposites are congruent in all the three sides. As all three sides are congruent, that means all three angles are also congruent. So if we consider that the sum of all the angles is degrees, and all three angles are congruent.

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