BBC Bitesize - How to show angles in a n-sided polygon add to 180° × (n-2)

15 Area & Perimeter Exit Slips! Finding the Perimeter of Polygons Finding the Perimeter with Missing Sides Finding the Perimeter of Units Finding the Area of Polygons Finding the Area with Missing Sides Finding the Area of Units Finding Area & Perimeter of Word Problems Common Core Standards: 3.MD.C.6 , 3.MD.C.7 , 3.MD.C.7A , 3.MD.C.7B , 3.MD.C.7D , 3.MD.D.8