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the radius is 10.5 inches.
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Wrong!
Circumference = 2*pi*Radius
Or, Radius = Circumference/(2*pi)
So circumference = 21 inches implies radius = 3.34 inches (to 3 sf)
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∙ 12y ago
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What is the circumference of a circle with radius of 21 cm?
132cm
What is the diameter of a circle with a radius of 21 ft?
If radius=21 ft, then diameter = 2*radius = 42 ft
Diameter of 66 inch circumference?
Divide your circumference by pi. Diameter is 66 / 3.141592654 = 21 inches.
How many square feet in a 42 inch diameter circle?
The radius of the circle is 21 inches. The area of the circle is (pi) times (radius squared) = pi times 441 = 1,385.44+ square inches. 1 square foot = 144 square inches. The area of the circle is (1385.44+ square inches) divided by 144 = 9.621 square feet (rounded to 3 decimal places).
How far does the tip of the minute hand of a clock move in 35 minutes if the hand is 9 inches long?
Assuming the 9 inches is from the pivot point to the tip of the minute hand: In 1 hour = 60 minutes the tip of the minute hand sweeps out the circumference of a circle with radius 9 inches. In 35 minutes, it sweeps out a fraction on 35 minutes/1 hour of this. The circumference of a circle is given by circumference = 2 × π × radius Therefore the tip of the minute hand moves: length = 35/60 × 2 × π × 9 in → length = 21/2 π in = 10½ π in ≈ 33.0 in
What is the circumference of a circle with the radius of 21 inches?
A circle with a radius of 21 inches has a circumference of 131.95 inches.
What is the circumference of a circle whose radius is 21 meters?
A circle with a radius of 21 meters has a circumference of 131.95 meters.
What is the circumference of a circle if r equals 21?
A circle with a radius of 21 units has a circumference of 131.95 units.
What is the circumference of a 21-inch circle?
The circumference of a 21-inch circle is: 66 inches.(C = d x Pi).
What is the circumference of a circle of radius 21?
The circumference is 42pi, or approximately 131.946864
What is the radius of a circle with a circumference of 21?
21/(2*pi) = a radius of about 3.342253805 units
What is the radius of a circle with a circumference of 21 units?
The radius is 3.34 units.
What is the circumference of a circle with radius of 21 cm?
132cm
if a circle has a radius of 21 what is the circumference?
C = 131.95
If the radius of a circle is 21cm What is the radius?
The radius of any circle is the straight line distance from the centre of the circle to any point on the circumference of the circle. The radius being 21 cm makes no difference to the definition of the radius; it just means that the straight line distance from the centre of that circle is 21cm away from any point on the circumference of that circle. The radius of a circle with a radius of 21 cm is 21 cm.
What is the circumference of a circle with a radius of 21 feet?
65.94 feet
What is the circumference of a 21-inch circle how can solve?
By a 21-inch circle I presume you mean that the diameter is 21 inches. So the radius is half as long, 10.5 inches. The formula for the circumference of a circle is 2 pi r, where r is the radius. Pi is about 3.14. That is accurate to 2 decimals, or 3 significant digits all together. I use that approximation because the dimension we are given has 2 significant digits. So the circumference is pi times the diameter; we multiply 3.14 by 21 inches and get 65.94. To 2 significant digits, that is 66 inches. If you meant that the radius was 21 inches, then the circumference would be twice as much, or 132 inches.
