Question

How many diagonals does each of the following have?

iii. A triangle

Answer 1

To find: The number of diagonals in a triangle

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

So, number of diagonals in a triangle $=\frac{3(3-3)}{2}$

$=0$

Hence, a triangle has no diagonals.