Ambrose: What's the perimeter? Pizza Boss: The perimeter is the outside of the shape, like the room. The area is the inside. Perimeter outside, area inside. Perimeter outside, area inside.

of the area of the circle. \(A = \frac{135}{360} \times π \times 4^2\) \(A = 18.85 (2 d.p.)\) Calculate the perimeter of the sector. The perimeter is made up of an arc and two straight sides.