how to find a perimeter of a 75 sidedpolygon please answer me

Dear Student!

Here is the answer to your query.

Perimeter of a closed figure can be defined as the length of the boundary of the figure

and perimeter of a polygon is the sum of the length of all the side.

∴ Perimeter of 75 sided polygon = sum of the lengths of 75 sides of given polygon.

Cheers!