A triangle is a type of polygon, which has three sides, and the two sides are joined end to end is called the vertex of the triangle. An angle is formed between two sides.

The sum of all three interior angles is equal to 180 degrees.

The exterior angles of a triangle always add up to 360 degrees.

Explanation: In this example, we need to find out the area of the triangle using given three sides 5 , 6 , 7 units in length \$√[s(s-a)(s-b)(s-c)\$ then we get \$6√6\$ square units.