Use the formulae for the area and circumference of a circle, replacing the symbol for the radius or the diameter with the known radius or diameter. As a reminder, the radius is 1/2 the diameter.Circumference = pi x diameter area = pi x radius squared
It is: pi*3.52 = 38.485 square inches rounded to three decimal places
Rounded to two decimal places, 100 / 7 = 14.29.
No, but it's a relatively close approximation. 22/7 rounded to six decimal places is 3.142857, whereas pi is 3.141593. ---- 22/7 is only correct to 2 decimal places. A better approximation is 355/113 which is correct to 6 decimal places. 355/113 = 3.141592920353... π = 3.141592653589793... If you need to do accurate calculations involving pi you should use the π (pi) key on a calculator.
If you mean area of a circle then it is: pi times 3.5 squared = 38.485 square units rounded to 3 decimal places
Volume of cylinder: pi*12 squared *7 = 3166.725 cubic units rounded to 3 decimal places
The approximation of Pi is 22/7 and the most used form is 3.1416 (rounded up). To 30 decimal places, pi is : 3.14159 26535 89793 23846 26433 83279
sin(pi/7) = 0.43388 (to 5 decimal places)
circumference = pi*7 = 21.991 feet to 3 decimal places
It is: 0.389 rounded to 3 decimal places
Not exactly. To 2 decimal places, pi is 3.14 To 7 decimal places, pi is 3.1415927 To 9 decimal places, pi is 3.141592654 pi does not terminate - it can be expressed to as many decimal places as required. 3.14 is often used as an approximation when doing calculations as it's easier to work with (than 3.141592653... ).
Volume of the sphere: 4/3 times pi times 7^3 = 1436.755 cubic units rounded to 3 decimal places
It is 41.176% rounded to 3 decimal places
By dividing the diameter of a circle into its circumference which is about 22/7 but the true value of pi is not known as a decimal because its decimal places can go on to infinity.
1/7 is 14.29% rounded to two decimal places.
It is: 1/7 times 100 = 14.29% rounded to two decimal places
It is: (7/85)*100 = 8.24% rounded to 2 decimal places
Circumference = 2 x Pi x r = 2 x Pi x 2.25cm = 14.14cm (approx. correct to 2 decimal places)
Rounded to two decimal places, 2.97 = 1724.99.