Diameter equal 2r (d=2r)
So if your Diameter is 28 then:
28=2r (divide 2 on both sides)
14=r
therefor the radius is 14
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The diameter would be 28 cm.
14 cm
The radius of a circle is half of its diameter
1/2 of the diameter
The diameter of a circle is twice its radius. Thus the radius of a circle is half its diameter. → a circle with a diameter of 15 cm has a radius of 15/2 cm = 7.5 cm