Question

sum of all interior angle of a 7 sided polygon is how much degrees

Answer 1

polygon = 7 sides
so (n-2 × 180) {n = no.of sides}
= (7-2 × 180)
= 5 × 180
= 900°

Answer 2

sum of all interior angles of 7 sided polygon
=(2n-4)×90°
=(2×7-4)×90°
=10×90°
=900°
Hope it helps you.