**Equilateral Triangle :**

An **equilateral triangle** is the one which has three equal sides and is a regular polygon, in this case with three sides. It also has three equal angles and therefore can be also termed as an **equiangular triangle**. All the features and properties described for regular polygons apply to an equilateral triangle.

**Properties:**

All three angles of an equilateral triangle are must be **60°**.

Since the angles are the same and the internal angles of any triangle always sum **180°**, each is **60°**.

**Parallelogram :**

**Parallelogram** is a quadrilateral which has both pairs of opposite sides parallel and equal in length. The opposite sides of a parallelogram are of equal length, and the opposite angles of a parallelogram are equal. It is similar to other quadrilaterals like the square and the rhombus.

**Properties of a Parallelogram:**

Any side can be considered as a base for calculating the area

The altitude or height of the parallelogram is perpendicular from the base to the opposite side

The area of a parallelogram can be calculate by multiplying a base by the corresponding altitude

The perimeter of a parallelogram is the distance around it or the sum of its sides

In the figure, angles **x°**are the same, and angles **y°** are the same

The Area and Perimeter of the Parallelogram can be derived by using the following formula:

**Area: A = bh**

where ** b = base**

and

** h = altitude** ( perpendicular height from the base )