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In calculations, most people use 3.14 or 3.14159. Radius of a wheel is the span between center and edge, diameter ist … What distance, in kilometres, does the wheel cover the wheel after 100 revolutions? The next equations show how you can instead find the diameter from them. C /D = Pi or C/2R = pi. (a non-terminating value) For easier computation of the circumference of a circle, the value of pi is taken to be 3.14 (π = 3.14). Why is 22/7 (pi) used to calculate circumference and area of a circle? There are other better approximations - Yacas book of algorithms suggests 4 other methods to find it. L = Length of chord from PC to PT. $\begingroup$ Archimedes approximated $\pi$ by $22/7$ using a regular 96-gon. It is known as subtangent. Given the radius or diameter and pi you can calculate the circumference. 0.22 B. If the two wheels are front and rear wheel, both distances should be equal. R = Radius of simple curve, or simply radius. In this case circumference = 2*3.142*(70/2)=219.94 cm. π (pi) is a mathematical constant that relates a circle's circumference to its diameter. Sometimes it is approximated by the fraction 22/7. Number of revolutions = Distance/Circumference =110/219.94=0.5 revolutions. Answer is the wheel will take 0.5 revolutions In the past, many math books listed Pi as 22/7. The diameter is the distance from one side of the circle to the other at its widest points. Point Q as shown below is the midpoint of L. L c = Length of curve from PC to PT. For a circle the length of distance covered in 1 revolution is = circumference = 2*3.142*radius. Again, this is just an approximation but it is better than the value of 3 ( actually 22/7 is closer to Pi than just writing 3.14 ). Distance is the covered distance. We don't. Mwaka used 44 pegs to mark around a circular animal shed. It’s not. The diameter will always pass through the center of the circle. ... To find the distance travelled, multiply the circumference of the wheel by the number of revolutions taken. The radius is half of this distance. If you know some integration, look at this: Proof that 22/7 exceeds π - Wikipedia. (Take pi - 22/7) A. It is an irrational number, so it doesn't have a decimal representation. Time difference = Actual time – time taken at 4 km/hr = 3 – 10/4 = 1/2 hour Hence, he will be early by 30 minutes. (Take pi - 22/7) Revolutions specifies, how often the wheel turns around at the covered distance. [math]\dfrac{22}{7}[/math] is not equal to the mathematical constant [math]\pi[/math]. The radius – the distance from the circle's center or origin to the edge, one half the diameter; The circumference – the length of the outside boundaries of the circle; Starting from the diameter, you can easily find the other two. The approximate value of pi (π) = 22/7 = 3.1415926535897…. ... 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