Kendall, the formula is usually given as C = 2(pi)r, but remember that the diameter is twice the radius, so it can also be shown as C = (pi)d
5 1/4 = 21/4
(21/4)(22/7) = 462/28 = 33/2 = 16 1/2
Kendall T.
asked • 01/22/18What is diameter 5 1/4 of circumference
(math help) the question says diameter=5 1/4 and you do the # * 22/7 is the equation but I dont get it because you are finding circumference with the diameter
More
2 Answers By Expert Tutors
Kenneth S. answered • 01/22/18
Tutor
4.8
(62)
Expert Help in Algebra/Trig/(Pre)calculus to Guarantee Success in 2018
Your question is GARBLED. Undoubtedly you are given: Diameter = 5.25 units, and you want to find either Area or Circumference. C = (pi)(diameter) = 3.1416(5.25) ⇐ you do the calculation!
Area = (pi)(radius2) = 3.1416(5.25/2)2 since radius is half of the diameter; you can do the calculation.
NEVER USE 22/7 AS A VALUE FOR PI...that's simply ridiculous in this era of Ubiquitous Calculators.
Even 3.1416 is not exact, but 4 decimal places is accurate enough for practical purposes.
(Feel free to call this matter of accuracy for pi to the attention of your teacher and your parents.)
David W.
22/7 = 3.142857143 [22/7 is a good estimate and is a time-saver with "magic numbers"]
Many problems (on homework or standardized tests) use "magic numbers" so that the calculations are easy. For example, a 7-inch diameter drain pipe is 22 inches around.
Report
01/22/18
Still looking for help? Get the right answer, fast.
Ask a question for free
Get a free answer to a quick problem.
Most questions answered within 4 hours.
OR
Find an Online Tutor Now
Choose an expert and meet online. No packages or subscriptions, pay only for the time you need.
David W.
π = C/d [the Circumference of a circle divided by the diameter of the circle]
01/22/18