Question

find the number of sides of polygon,the sum of whose interor angles is 20 rightly angles? ​

Answer 1

Answer:

5 sides

Step-by-step explanation:

Hope it Helps

Answer 2

Answer:

Step-by-step explanation:

Sum of interior angles of any polygon = (2n - 4)*90° where n is the no. of sides of the polygon.

We have to find n.

20 right angles = 20*90 => 1800°

Thus, 1800 = (2n - 4)*90

=> 20 = 2n - 4

=> 2n = 24

∴ n = 12

Thus, the polygon has 12 sides.