0
Add your answer:
Earn +20 pts
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.
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 circumference if the radius is 21 inches?
131.95 inches, approx.
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 if it's diameter is 21 inches?
Circumference = 21*pi
What is the radius of a circle with a 21 inch circumference?
the radius is 10.5 inches. * * * * * Wrong! Circumference = 2*pi*Radius Or, Radius = Circumference/(2*pi) So circumference = 21 inches implies radius = 3.34 inches (to 3 sf)
How many inches is the circumference of a circle if its radius is 21 inches?
C = 131.95 inches.
Is About how many inches is the circumference of a circle if its radius is 21 inches?
The circumference is about 131.9 inches. (C = r x 2 x Pi)
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 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.
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.
if a circle has a radius of 21 what is the circumference?
C = 131.95
What is the circumference if the radius is 21 inches?
131.95 inches, approx.
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 if it's diameter is 21 inches?
Circumference = 21*pi
