Doubling the radius doubles the circumference.
9*pi or 28.27 cm (to 2 dp)
56.549 cm
Construct a circle with a 4.5 radius. The circle's circumference is 360 degrees. So mark out 3 by 120 degrees on the circumference and join them to the centre of the circle which will divide the circle into three equal parts.
Diameter of a circle = circumference/pi
Doubling the radius doubles the circumference.
9*pi or 28.27 cm (to 2 dp)
56.549 cm
The circumference of a circle that is 9 cm wide is: 28.274 cm
56.549 cm
Construct a circle with a 4.5 radius. The circle's circumference is 360 degrees. So mark out 3 by 120 degrees on the circumference and join them to the centre of the circle which will divide the circle into three equal parts.
Diameter of a circle = circumference/pi
Diameter of a circle = circumference/pi
The circumference of a 13.5 diameter circle is: 42.41(diameter x pi = circumference).
Circumference of the circle: 2*pi*9 = 18*pi cm
The circumference of a circle if the diameter is 12cm is 37.7cm
The circumference of a circle with a diameter of 6cm is about 18.85cm