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.

Follow the formula instruction (multiply 12 by 5), 12 × 5 is 60. The perimeter of the regular pentagon is 60 cm. The plumber charges £35 per hour. For 1 hour this charge is 1 × 35, for 2 hours ...