The perimeter of a 2D shape is the total distance around the outside of the shape. The area of a 2D shape is ... Circle theorems are used in geometric proofs and to calculate angles.

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.

Isoperimetric Problem: A classical problem in geometry that seeks to determine the shape that maximizes area for a given perimeter or minimizes perimeter for a given area. Wasserstein Type Energy ...