Here's my working for 1) You need to find the exterior angle, then divide by 360 to find the number of sides:
Applying these steps :
180 (Interior Angles) - 162 = 18 (Exterior angle)
360 ÷ 18 is 20 sides
For 2)
Its the same method, so apply the steps:
180 - 175 = 5
360 ÷ 5 = 72 sides
Hope it helps! :)
