Question

Which polygon has no diagonals

• A. A triangle
• B. A rectangle
• C. A square
• D. A rhombus

Answer 1

The correct option is A A triangle

A triangle has no polygons.

Number of diagonals in a polygon $=\frac{n(n-3)}{2}$

Here $n$ is the no. of sides.

Since a triangle has $3$ sides, the number of diagonal it has will be $0$.