Do note that the perimeter/circumference of a circle can be found using this formula: πD or 2πr.
Hence, with the information given that the circle has a radius of 5cm, the circumference of the circle is:
Formula = πD
Diameter = Radius x 2
= 5cm x 2
= 10cm
π = 3.14 (depending on what the question states π to be)
Circumference of the circle = 3.14 x 10cm
= 314cm
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The circumference of a circle with a radius 5cm is: 31.4 cm
Radius of a circle is half its diameter, 1/2 of 5cm =2.5cm
2.5cm !
10cm
The diameter is twice the radius.