c = pi * d
90in = pi * 30in
pi = 3 .. which is incorrect
You need to qualify the 30 inches. Is it the diameter or circumference of a circle?
Diameter = 30/pi inches
If the circumference of a circle is 30 cm its diameter is: 9.549 cm
circumference = 30*pi = 94.248 inches rounded to 3 decimal places area = pi*15 squared = 706.858 square inches to 3 decimal places
circumference = 30*pi feet
The circumference of a circle 30 inches in diameter is 30*pi inches
Circumference = pi * diameter C = pi(3.14159 should do) * 30 inches = 94.2478 inches circumference
You need to qualify the 30 inches. Is it the diameter or circumference of a circle?
Diameter = 30/pi inches
Divide the circumference by pi.
About 30 inches
d=9.5541401 in.
30 inches diameter or 93 inches circumference
diameter of the circle = 30/pi = 9.549 inches to 3 dp
The circumference of a circle with diameter of 30 centimeters is: 94.2 cm (diameter x Pi = circumference).
If the circumference of a circle is 30 cm its diameter is: 9.549 cm
The circumference of every circle is (pi) x (diameter).The circumference of this particular circle is 30 pi.