Using the Circumference And Area.
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Why is this an automotive question? The radius of any circle is half of the diameter.
The answer depends on what information about the circle is given: area, radius, length and angle of arc, area and angle of sector, etc. In each case, there is a different way to calculate the diameter but, since there is no information on what is known, it is not possible to answer the question.
tell what the diameter (d) and radius(r) of each circle is by using this information
there is a center point, an arc, a radius, a diameter, a chord.
The radius is half the diameter (R = D/2). The radius goes from the center of the circle to a point along the perimeter, while the diameter goes across the entire circle, connecting two points opposite each other along the perimeter. If the radius is 7.5 feet, then the diameter is 13 feet.