Yes.
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Circumference (perimeter) of a circle = pi x diameter Diameter of a circle is the straight line distance from one side to the other which passes through the centre of the circle.
4.8 cm The radius of any circle is one-half its diameter.
Well, honey, the diameter of a circle is the distance across the center, so for a 30-inch circle, the diameter would be 30 inches. I mean, it's right there in the question, darling. So, yeah, the diameter of a 30-inch circle is 30 inches.
Semicircle
A diameter of 84cm, means the circle is 84cm wide. A diameter is a line or measurement from one edge, through the centre, to the opposite edge of the circle.