The circumference of a circle with a diameter of 45 inches is 141.37 inches.
The diameter of a circle with a circumference of 45 cm is: about 14.32 cm
The radius of a coin with diameter of 45 mm is : 45/2 = 22.5mm The circumference of a coin with diameter of 45 mm is 45*pi = 141,372mm rounded to 3 decimal places
If the circumference of a circle is 45 cm the length of the diameter in centimeters is: about 14.32 cm
141.372 Circumference equals pi times the diameter: 45 x 3.1416 = 141.372 If you memorize the formula, it will serve you well.
The idea is to multiply the diameter by pi.
divide the circumference (c) by pi (3.14) and then you have diameter. you will have to measure the radius by hand.
Circumference = diameter x pi, thus circumference/pi=diameter. Now all you have to do is plug in your numbers: 45cm/3.14= approx. 14.33 cm diameter
C = D * pi = 45 * 3.14159(...) = 141.372 cm
37 45/64 inches.