If "3 inches" refers to the circle's diameter, then the radius is one-half of that.
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A circle with a 12 inch diameter has a 6 inch radius.
circumference= pi(3.14) by the diameter. if your given the radius, double the radius and times by pi.
The Diameter of a Circle is twice the Radius.thus for a 52 inch Diameter Circle the Radius will be 52/2=26 inches.
Area of a circle: pi times radius squared
Yes if 1.5 is the diameter of the circle but no if 1.5 is the radius of the circle.