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.

It finds an approximation of pi by determining the length of the perimeter of a polygon inscribed ... unknown in Archimedes' day—Archimedes used geometry instead. For example, he knew the ...

ADA: Perimeter is the length of the lines around ... This short animated film is from the BBC Teach series, Neon City: Measurement and Geometry. Depending on the focus on your lesson, you may ...