The circumference is defined by 2* PI * radius
Your calculation is therefore correct, but is depends upon what number of decimal places you need to quote your answer.
The proper answer to two decimal places is 81.68.
The radius of a circle with a circumference of 13 feet is: 2.069 feet.
The circumference of a circle with a 13-inch radius is: 81.68 inches (r x 2 x pi = circumference).
A circle with a radius of 8 inches has a circumference of 50.27 inches.
Circumference = 2*pi*radius = 26*pi inches
radius in feet = 13/(2*pi)
The circumference of a circle with a radius of 13 is: 81.68 units.
The radius of a circle with a circumference of 13 feet is: 2.069 feet.
radius = 2.069
The circumference of a circle with a 13-inch radius is: 81.68 inches (r x 2 x pi = circumference).
2 x 13 x pi = 81.68 Circumference of a circle = 2*pi*radius or pi*diameter Circumference = 2*pi*13 = 81.68140899
The circumference is about 81.7 feet.
The circumference is about 81.7 feet.
A circle with a radius of 8 inches has a circumference of 50.27 inches.
2*pi*radius = circumference 2*pi*radius = 13 Making the radius the subject of the formula is: radius = 13/(2*pi) = 2.06901426 feet Check: 2*pi*2.06901426 = 13 feet
Circumference = 2*pi*radius = 26*pi inches
radius in feet = 13/(2*pi)
It is: 2*pi*13 cm