If the radius is 4, the width is 8 inches. If it is a 4 inch circle diametrically the width is 4 inches
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The area of a 5-inch circle is: 19.6 square inches.The area of a 4-inch circle is: 12.6 square inches.The area of the 5-inch circle is 55.6% larger than the 4-inch circle
In a circle with a diameter of 4, there would be approximately 12.56 square inches in the circle.
Area of circle in square inches = pi*radius squared
12.5664 Sq.In.
1.27 inches To find diameter (width of a circle): C = 3.14159 (pi) * diameter 4 = 3.14159 * d d= 1.27 inches