The diameter (d) of a circle is twice as long as the radius (r). if r=3m and n is equal to approximately 3.14, write the expression that could be used to find the circumference of the circle

Expression for circumference of circle:

S = 2 π r or S = π d

π = 3.14 r = radius d = diameter = 2r

Circumference S = 2 * π * r = 2 * 3.14 * 3 m = 18.84 meters

From the problem statement:

d = 2r

r = 3m

n = 3.14 ≈ π

Answer:

Since the circumference of a circle is:

C = 2πr

Just substitute some of the variables for ones that have been defined in the problem statement:

C = 2 (n) (3m)

C = 6nm