If r = 8 inches then C = 50.27 inches.
Diameter = 6 inches Radius = 3 inches Circumference = 2 x pi x radius = 18.84955592 inches
Circumference of circle: 31.4 inchesArea of circle: 78.5 square inches
Assuming a spoke represents the radius of the circle, each one would be 4.29 inches long. When given the circumference (27 inches), the radius (spokes) is calculated using the formula r = C / 2(pi); or Radius = 27 inches / [2(3.14)].
The radius is: 6.267 cm
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.
Diameter = 6 inches Radius = 3 inches Circumference = 2 x pi x radius = 18.84955592 inches
Circumference of circle: 31.4 inchesArea of circle: 78.5 square inches
360/30*2 = 24 = circumference of the circle 24/2*pi = 3.819718634 inches = radius of the circle
Assuming a spoke represents the radius of the circle, each one would be 4.29 inches long. When given the circumference (27 inches), the radius (spokes) is calculated using the formula r = C / 2(pi); or Radius = 27 inches / [2(3.14)].
Circumference of a circle = 2*pi*radius or pi*diameter
The radius is 3.82 cm
To find the radius of a pizza with a circumference of 47.1 inches, you can use the formula for the circumference of a circle: C = 2πr, where C is the circumference and r is the radius. Rearranging the formula to solve for the radius, you get r = C / 2π. Plugging in the given circumference of 47.1 inches, you get r = 47.1 / (2 x 3.14159) ≈ 7.5 inches. Therefore, the radius of the pizza is approximately 7.5 inches.
The radius is: 6.267 cm
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.
14 inches.
Oh, dude, the radius of a circle is just half of the diameter, so for an 11-inch circle, the radius would be 5.5 inches. Like, it's just basic math, nothing to lose sleep over. So yeah, the radius is 5.5 inches, but who's really measuring, right?
Circumference of a circle = 2*pi*radius or diameter*pi Its diameter = circumference/pi