Question

(iii) Find the numbe of diagnols in the polygons
with 18 and 20 sides.​

Answer 1

Answer:

There are always no of diagonal are 2 because no of diagonal never changes

Step-by-step explanation:

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Answer 2

• We know,

$\boxed{ \bf \large \text{Number of diagonals} = \frac{n(n - 3)}{2}}$ where, n is the number of sides in the polygon.

Here,

• Number of diagonal in polygon with 18 sides =

$\sf \implies \frac{18(18 - 3)}{2} \: \: \to \: 9(15) \: \: \to \red{ 135}$

And,

• Number of diagonal in polygon with 20 sides =

$\tt \implies \frac{20(20 - 3)}{2} \: \: \to \: 10(17) \: \: \to \red{ 170}$