If r = 4 cm, find C. Round your answer to the nearest 0.1 unit.
2007-04-03 04:10:30 · 4 answers · asked by LALALAND 1 in Science & Mathematics ➔ Mathematics
C = 2*pi*r, where r is radius as given and pi is 3.14159. You have r, so you can calculate C with simple arithmetic. When you have the result, you need to round it. Since you're rounding to the nearest 0.1, you need to look at the digit in the hundredths place. If it is 5 or greater, round up. If it is 4 or lower, round down.
2007-04-03 04:13:24 · answer #1 · answered by DavidK93 7 · 0⤊ 0⤋
Is this the radius of a circle and the circumference of the same circle?
You'll get better answers in life if you do a better job of asking the questions.
c=2*pi*r
2007-04-03 11:21:58 · answer #2 · answered by Anonymous · 0⤊ 0⤋
I assume C means circumference of a circle
Circumference of a circle formula
C = 2 Ï r
C = 2(3.141592654)(4)
C = 6.283185307(4)
C = 25.13274123 cm
C = 25.1 rounded to one decimal place
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2007-04-03 11:56:22 · answer #3 · answered by SAMUEL D 7 · 0⤊ 0⤋
put this in the caculator (2)(3.14)(4*4)
*= multiply
2007-04-03 11:13:53 · answer #4 · answered by me. 3 · 0⤊ 1⤋