The diameter of a circle is twice the length of its radius. So, to find the diameter of a circle with a radius of 19 cm, you would multiply 19 cm by 2. This gives you a diameter of 38 cm.
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The diameter is twice the radius ! Therefore the answer is 19cm !
If a circle has a diameter of 19cm the circumference is: 59.7 cm
to get the diameter from the radius you simply multiply the radius by 2 since the radius is half the diameter. d=2r where d = diameter and r = radius
The radius is half the diameter. So, if the diameter is 8, then the radius is 4.
diameter = 2*radius