To find the length of the circumference we would use C = Pi times Diameter, so if we want to find the diameter instead of the circumference we just need to rearrange the formula: D = circumference divided by Pi
1. move the diameter over the = sign and divide by the circumference
So for your example:
D = C divided Pi
D = 4 divided by Pi ( if you can't use a calculator use 3.14)
D = 1.27323....
D = 1.3 to one decimal place
hope this helped
The ratio between the diameter of a circle and its circumference is constant: π. A circle whose circumference measures 3 feet has a diameter of 3/π feet: approximately 11.459 inches.
The circumference of of a circle whose diameter is 1.5 feet is: 4.712 feet (diameter x Pi = circumference).
The circumference of a circle whose diameter is 1.5 ft is: about 4.712 feet.
The circumference of a circle whose radius is 6 inches is: 37.7 inches.
A circle with a diameter of 2.5 units has a circumference of 7.9 units.
The circumference of a circle whose diameter is 8 inches is about 25.13 inches.
25.12 inches
Circumference = 7*pi which is about 22 inches
The circumference of circle whose diameter is 10 is: 31.42 (diameter x Pi = circumference).
The circumference of a circle with a radius of 12.5 is 78.54 to two decimal places.
The diameter of a circle whose circumference is 314 is about 1 (99.95).
The ratio between the diameter of a circle and its circumference is constant: π. A circle whose circumference measures 3 feet has a diameter of 3/π feet: approximately 11.459 inches.
The approximate diameter of a circle whose circumference is 21cm is: 6.68cm
The circumference of of a circle whose diameter is 1.5 feet is: 4.712 feet (diameter x Pi = circumference).
The circumference of a circle whose diameter is 1.5 ft is: about 4.712 feet.
The radius and diameter of a circle whose circumference is 25.12 are:r = 4d = 8
The circumference of a circle whose radius is 6 inches is: 37.7 inches.