The diameter of a circle is given by the next formula:
D = 2R
Where D is the diameter and R is the radius.
Now:
If the radius is, we replace the R on the diameter formula:
a) R =4.3cm:
D = 2R
D = 2(4.3cm)
D = 8.6 cm
b) R = 12 feet
D = 2(12 feet )
D = 24 feet
c) R=8.25 km
D = 2(8.25 km)
D = 16.5 km
d) 21 2/3 meters
D = 2(21 2/3 meters)
D= 130/ 3 meters or 43 (1/3) meters
e) 5 in
D= 2(5in)
D= 10 in
