**Triangles Classified by Sides**

**1. Scalene Triangle**

**2. Isosceles Triangle**

**3. Equilateral Triangle**

**Triangles Classified by Angles**

**4. Acute Triangle**

**5. Right-Angled Triangle**

**6. Obtuse Triangle**

**7. Equiangular Triangle**

**8. Oblique Triangle**

**Basic Properties of Triangles**

Along with understanding different types of triangles, it is also necessary for us to get an idea about the basic properties of the triangles. These properties are explained below;

**i.** According to the angle sum property of a triangle, the sum of all the angles of a triangle should be 180°.

**ii.** If we add two sides of a triangle, their sum will be greater than the third side of the triangle.

**iii.** The side which is opposite to the largest angle of the triangle is known as the largest side of the triangle.

**iv.** If we know two sides of a triangle, we can easily find the third side of the triangle by using Pythagorean Theorem.

**v.** If we know the two angles of a triangle, we can easily find the third angle of the triangle by using the angle sum formula of a triangle.

**Real-Life Example of Types of Triangles (First Five)**

**i.**Most of us see traffic signs daily. These traffic signs are the best examples of equilateral triangles because all the angles and sides of these traffic signs are equal.

**ii.**Bermuda Triangle is also another real-life example of the triangle. The Bermuda Triangle is a loosely defined triangular area in the Atlantic Ocean. In the Bermuda Triangle, more than 50 ships and 20 aircraft are my sterically disappeared.

**iii.**Pyramids are also the best real-life examples of triangles. These are ancient mountains that were constructed by the Egyptians. The shapes of these pyramids are tetrahedral i.e. there are four triangular regions in these ancient mountains.

**iv.**To support the bridges, we construct triangular shapes. We call them Truss bridges. These supporting shapes can distribute the weight of the bridges. Sailing boats are also the best real-life examples of triangular shapes. Some years ago, the designs of these shapes were square but nowadays, almost all the sailing shapes have triangular designs.

**Real-Life Example of Types of Triangles (Last Five)**

**v.**The roofs of the houses are triangular. These shapes of the roofs don’t allow rain and snow to stay for a longer period.

**vi.**While constructing the staircases, the constructors use knowledge of triangles. Its reason is that they have to build these staircases in a triangular form. These staircases form right-angled triangles. When we have to place the staircase in front of a wall, we have to make a triangular shape.

**vii.**To make some buildings appealing and interesting, we construct these buildings in a triangular shape. The most important example of these kinds of buildings is the Eiffel Tower.

**viii.**We have to use triangular formulas to find the height of a pole or a mountain. For this reason, we use the concept of a right-angled triangle.

**ix.**Sandwiches and pizzas are the favorite foods of the young generation. Most of people start their day by eating sandwiches and the shape of these sandwiches is also triangular. Some pizzas are also available in a triangular shape.

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