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# Is a triangle with two equal sides always isosceles?

## Is a triangle with two equal sides always isosceles?

An isosceles triangle therefore has both two equal sides and two equal angles. A triangle with all sides equal is called an equilateral triangle, and a triangle with no sides equal is called a scalene triangle.

What is the sum of an isosceles triangle?

180°
The sum of the internal angles of all triangles is always 180°. Therefore, the angles of an isosceles triangle add up to 180°.

### How do you prove that two sides of an isosceles triangle are equal?

Hence proved. Theorem 2: Sides opposite to the equal angles of a triangle are equal. Proof: In a triangle ABC, base angles are equal and we need to prove that AC = BC or ∆ABC is an isosceles triangle….Isosceles Triangle Theorems and Proofs.

Types Of Polygon Parts Of A Circle
Reflection Symmetry Surface Area Of A Cone

What does an isosceles triangle sides add up to?

All the three angles situated within the isosceles triangle are acute, which signifies that the angles are less than 90°. The sum of three angles of an isosceles triangle is always 180°, which means we can find out the third angle of a triangle if the two angles of an isosceles triangle are known.

## How many sides are equal on a isosceles triangle?

two sides
In geometry, an isosceles triangle is a triangle that has two sides of equal length.

What is true about an isosceles triangle?

In geometry, an isosceles triangle is a triangle that has two sides of equal length. Sometimes it is specified as having exactly two sides of equal length, and sometimes as having at least two sides of equal length, the latter version thus including the equilateral triangle as a special case.

### How do you justify an isosceles triangle?

If a triangle has two congruent angles, then the sides opposite those angles are congruent. In other words, iso-angular triangles are iso-lateral (isosceles). This is the converse of the isosceles triangle theorem.

How many equal sides are there in an isosceles triangle?

two equal sides
An isosceles triangle can be drawn in many different ways. It can be drawn to have two equal sides and two equal angles or with two acute angles and one obtuse angle.