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What is the area of a circle if it has a diameter which is 18 feet long?
The area of a circle is equal to πr2 where π (pi) is equal to approximately 3.142 and r represents the radius of the circle. Because the question gives you the diameter and not the radius you have to use the measurement of the diameter to calculate the radius. Remember that the radius is equal to half the diameter. So if the diameter is equal to 18 feet, then the radius of this particular circle is equal to 9 feet. Plugging this into our equation for area we get: area = π(92) area = 3.142(81) area = about 254.5 ft2 (don't forget that the answer is in squared feet not just feet)
If a radius of a circle is 9mm what is the diameter?
Diameter = 2 x radius = 18 mm .
What is the radius of 18 inches?
If the diameter of a circle is 18 inches then its radius is 18/2 = 9 inches
What is the diameter of a circle with a radius of 9Cm?
r= 9 so diameter is 2x the radius =18 cm
If a circle has a radius of 9 cm how long is the circle's diameter?
The diameter is always double the radius so in this case, it is 18cm
