If the diameter is 68, then the radius is 34.
3.14 * 34^2 = 3629.84
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3,631.68 square units.
The diameter will be: 68/pi
Surface area of the ball = 4*pi*342 = 4624*pi square mm
The area of a circle is calculated by multiplying the square of its radius by pi and can thus be represented with the equation: A = πr^2 where A= area and r=radius. The radius of a circle is equal to half its diameter. Consequently the first step to answering this question would be calculating the radius of the circle. r= d/2 = 68/2 =34 miles This means that the formula to calculate the area for a circle with a diameter of 68 miles would be: A = π(34^2) Working this through would give us: A = π(34^2) = 1156 π = 3631.68 square miles (2 d.p.)
The area of a circle with a diameter of 9.4 m is: 69.4 m2