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The radius is half of the diameter. So, if the radius is 7 the diameter is 14.
The diameter of a circle is a straight line passing through the center of the circle and connecting two points on the circle. The length of the diameter is equal to twice the length of the radius of the circle. Since there are 2.54 centimeters in an inch, converting the diameter from inches to centimeters would involve multiplying the diameter in inches by 2.54.
It is the equivalent of 1.66 centimeters which is just over 1/2 an inch
Area = pi*r2A ratio.A = pi*(12)2-------------A = pi*(10)2cancel all like factors144/100= 1.44 times larger==============
Any number you like. You can have a tiny circle with a tiny diameter or a huge big circle with a big diameter. The diameter is simply the "width" of the circle. It is the length of the line from one side to the other which passes through the centre.