18mm or 1.8 cm
Diameter = 2 x radius = 9 meters
The radius is 9 inches because area of circle is pi*9 squared = 81pi square inches and the diameter is twice the radius which is 2*9 = 18 inches
the diameter would be 9 you would do 4.5+4.5 and that would = 9
I'm wondering what the original, or book, question actually asks, but in this case, a it is a circle larger in radius, diameter and circumference by the ratio 4:3; and in area by the ratio 16:9.
Doubling the radius doubles the circumference.
9 mm
9 mm
The radius of any circle is its diameter divided in half. So: 18mm/2 = a radius of 9mm
The diameter of a circle is twice the radius. A circle with a radius of 9 would have a diameter of 18. (9*2=18).
the diameter of a circle with the radius of 9m is 18m
the radius of a circle is half the diameter, so half of 1.8 is .9. The radius is .9km.
The diameter is always double the radius so in this case, it is 18cm
9
The answer is 9
Diameter = 2*9 = 18 units
9'
R=D/2. If the diameter of a circle is 18 inches, the radius is 9 inches. Radius = 1/2 diameter or 9"