#### If you want to find the measurement of each angle, then you can use the formula (n-2)180 and divide the result by the number of sides.

A square is a rectangle with four equal sides.

AB=BC=CE=EA

The sum of the interior angles of a square is 360 degrees.

Every corner  90 degrees (right) angle.

When two parallel lines are crossed by another line
(called the transversal).
You need to remember which angles are equal to each other.

#### Triangles

A triangle is a closed figure with 3 sides.
The sum of the interior angles of any triangle is 180 degrees.

There are three different types of triangles depending on the sides and angles.
Let's see the different types of triangles and their properties:

#### Polygons

Any triangle with a 90°-degree angle is a right triangle.
The measurement of the sides of a right triangle can be calculated with the following formula:

where C is the hypotenuse, A and B are the legs of the triangle

Let's see the different types of triangles and their properties:

#### 45:45:90

The right triangle 45-45-90 follows the ratio

X:X:X√2
Let's do an example: