WILL one of your mathematical readers kindly state whether the following empirical formula gives a nearer approximation to the perimeter of an ellipse than that usually given in pocket-books of ...

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.

So, the perimeter of this polygon is 36! 36 thingmys ... the increasing annoyance of the Measuring Crow. We also give the formula for the area of a triangle. This clip is from the series Kick ...

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 ...