What is the exact circumference of the circle?

10π ft

20π ft

40π ft

60π ft
circle with center a and diameter of 20 feet labeled.

Data:

Formula: diameter = 2*radius

Formula: (Circle length)


Solving: Using the data
diameter = 2*radius
20 = 2*r
2r = 20



Now, replace in the circumference length formula




The exact circumference of the circle is 

the law of definite proportions states samples of a compound will always contain the same proportion of elements by mass. in other words, a given compound will always contain the same elements in the same proportions by mass.the law of multiple proportions states when two elements combine with each other to form more than one compound, then the weights of one element that combine with a fixed weight of the other are in a ratio of small whole numbers.