# What is the name of a triangle with 2 sides that is the same length?

## What is the name of a triangle with 2 sides that is the same length?

isosceles triangle
An isosceles triangle therefore has both two equal sides and two equal angles. The name derives from the Greek iso (same) and skelos (leg). A triangle with all sides equal is called an equilateral triangle, and a triangle with no sides equal is called a scalene triangle.

What are the angles of a triangle with 2 equal sides?

An isosceles triangle is a type of triangle that has two sides that are the same length. The two marked sides are both the same length. The two angles opposite these two marked sides are also the same: both angles are 70°. All three interior angles add to 180° because it is a triangle.

### How many sides does an isosceles triangle have?

3
Isosceles triangle/Number of edges

What does an isosceles triangle equal?

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.

#### Which two angles are equal in an isosceles triangle?

Properties of Isosceles Triangle The two equal sides of an isosceles triangle are called the legs and the angle between them is called the vertex angle or apex angle. The side opposite the vertex angle is called the base and base angles are equal.

Are all isosceles triangles similar?

All isosceles triangles are not similar for a couple of reasons. The length of the two equal sides can stay the same but the measure of the angle between the two equal side will change, as will the base and the base angles.

## What is the difference between isosceles and equilateral triangles?

An ‘iso-sceles’ triangle is one that has ‘same legs’ – as opposed to ‘equal sides’. In an equilateral triangle, all the sides are the same; but in an isosceles triangle, two of the sides are ‘legs’, and the other is the ‘base’. And the legs are the same.

How can I prove this triangle is isosceles?

Given the coordinates of the triangle’s vertices, to prove that a triangle is isosceles plot the 3 points (optional) use the distance formula to calculate the side length of each side of the triangle. If any 2 sides have equal side lengths, then the triangle is isosceles.

### How do you prove an isosceles triangle?

You can prove a triangle is isosceles by finding the amount of right angles in a triangle. A triangle containing 2 right angles is classified as isosceles.

What are facts about the isosceles triangle?

Two sides of the Triangle are equal and are known as ‘Legs’.

• The angles opposite to the two equal sides of the triangle is always equal.
• The altitude of an Isosceles Triangle is measured from the base to the topmost vertex (angle made by the two legs) of the triangle.
• A right isosceles triangle has a third angle as 90 degrees.