If 0.75 is the radius, that's rational. If 0.75 is the diameter, the radius is also rational: multiplying two rational numbers together always gives you a rational number.
A circle with a radius of 18 centimeters has an area of 1,017.88 square centimeters.
If the circumference of a circle is 132cm its radius is: 21.01 cm
16 centimeters.
The radius is 3.82 cm
Area = pi R2 = 25 pi = 78.54 square centimeters(rounded)
Maybe
It the radius is r then the area is pi*r*r - which is pi times a rational number. pi is an irrational number, so the multiple of pi and a rational number is irrational.
It depends on the percentage. A 1 cm arc of a circle whose radius is 1 cm will represent 100*1/(2pi) % = 50/pi % and that is an irrational percentage. A semicircular arc of the same circle will represent 50%, which is rational.
A circle with a radius of 2.8 centimeters has a circumference of 17.59 centimeters.
A circle with a radius of 18 centimeters has an area of 1,017.88 square centimeters.
A circle that has a radius of 4.6 centimeters has an area of 66.5 square centimeters.
A circle with a radius of 15.5 centimeters has a circumference of 97.39 centimeters.
The area of a circle with a radius of nine centimeters is: 254.5 cm2
Yes and the area of any circle is an irrational number because its area is pi*radius squared whereas pi is an irrational number.
Eighty square centimeters
Almost anywhere in geometry. If a circle has an rational radius, its circumference and area will be irrational. Conversely, if the area is rational then the radius will be irrational. The ratio of the diagonal of a square to its side is always sqrt(2) - an irrational. So if the sides are of rational length then the diagonal is irrational. There are lots of other common objects where the fact that some of the measures are rational forces other measures to be irrational. And circles and squares are all around you. Your glass / coffee mug is probably circular. Your plates, bowls etc. The ratio of the length to width of standard paper (A4) is irrational.
50 centimeters