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)
Diameter = 2 x radius = 18 mm .
If the diameter of a circle is 18 inches then its radius is 18/2 = 9 inches
r= 9 so diameter is 2x the radius =18 cm
The diameter is always double the radius so in this case, it is 18cm
Diameter is twice the radius, so 18 feet.
The diameter of a circle is twice the radius. A circle with a radius of 9 would have a diameter of 18. (9*2=18).
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)
The radius of a circle is always half of the diameter. Therefore, if the diameter of a circle is 36 units, the radius would be half of 36, which is 18 units. The formula for finding the radius from the diameter is radius = diameter / 2. So, in this case, the radius would be 18 units.
It's 18 cm. The radius is half the diameter of a circle. Half 36 cm is 18 cm.
Radius is half the diameter. 36/2=18
It is 18 centimeters because your radius is exactly half of the diameter in any circle
Diameter = 2 x radius = 18 mm .
If the radius is 18 feet - then the diameter is 36 feet. The circumference measurement is irrelevant !
If the diameter of a circle is 18 inches then its radius is 18/2 = 9 inches
radius = 18/2 = 9 cm
Radius is half the diameter. 18 / 2 = 9 Answer: 9.0 cm