Learn about what is an **isosceles triangle**? And what are its properties. Actually, Isosceles triangle is one of the types of triangles. Now we will see what is the specialty of this triangle.

The definition of **Isosceles triangle** is given as “a triangle in which any two of its sides are equal in their measurements is called an isosceles triangle”. So if you are given a triangle and in that if two side’s lengths are same then we can conclude that the given triangle is **isosceles triangle**.

**Important properties of isosceles triangle:**

♦ The angles opposite to equal sides are equal in measurement.

Example:

In triangle PQR, the sides PQ and PR are equal in measurement so the ** opposite angles ∠Q and ∠R are equal**.

♦ If any two angles are equal then their opposite sides are equal in measurement.

Example:

In above triangle DEF, ∠E and ∠F are equal so their ** opposite sides DE and DF are equal** in measurement.

The above mentioned properties are very very important so I recommend you to remember this without forgetting.

**Formula for Perimeter of isosceles triangle:**

Let the triangle BCD be a **isosceles triangle** with BC = a units, BD = a units and CD = b units.

Then perimeter of triangle BCD = 2a + b units.

Hope that everything is understood without any doubts.

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