Question

For a 20 slided polygon, what is the sum of angles​

Answer 1

Step-by-step explanation:

sum of angle = (n-2)180°

n= 20

= 20-2(180°)

=18(180°)

= 3240°

Answer 2

I am going to state without proof that for n-sided polygon, the sum of all internal angles in degrees is given by,

$S_n=180^\circ(n-2)$

So, the sum of all internal angles of a 20-sided polygon is given by

$S_{20}=180^\circ(20-2)=18\times180^\circ=3240^\circ$

∴ the sum of all internal angles of a 20-sided polygon is 3240°