Question

What is a triangle?

Answer 1

Triangle.

A triangle is a three-sided polygon. It has three sides, and three vertices which form three angles

Any triangle with vertices $A,B$ and $C$ is denoted as $∆ABC$ and is shown below:

Types of a triangle:

• Scalene triangle: All sides are of unequal length.
• Equilateral triangle: All sides of equal length. All three angles are equal to $60°$.
• Isosceles triangle: Two sides of equal length.

Properties of a triangle:

• The sum of the length of two sides of a triangle is always greater than the length of the third side.
• The sum of all the three interior angles of a triangle is always equal to $180°$.

Thus, a triangle is a three-sided polygon. It has three sides, three vertices, and which form three angles.