The circumference of a circle being given, to find the diameter : a Rule (1). ... If the circumference be 91.106, what is the diameter ? ... the circumference is obtained from the diameter by multiplying the latter by 3.14159 ; and since the radius is half the diameter, we have as an expression for the area of the circle, a Diaro.
|Title||:||Loftus's inland revenue officer's manual|
|Author||:||William Harris Johnston|