You will need
• The value of the radius of the circle diameters, the value of the constant π.
Instruction
1
First you have to analyze the source data to the task. The fact that her condition cannot be explicitly said, what is the length of the radius of the circle. Instead, the task can be given to the length of the diameter of the circle. The diameter of a circle - a segment that connects two opposite points of the circlepassing through its center. After analyzing the definitions of circumference and diameter, we can say that the length of the diameter is twice the radius length.
2
You can now take the radius of a circle is equal to R. Then to find the length of a circle you must use the formula:
L = 2nr = πD, where L is the length of the circumference, D is the diameter of a circle, which is always 2 times greater than the radius.
3
You can see an example of the application of the formula: given a circle with diameter 8 cm is Required to find the length of the circumference.
Solution: L = 2*3,14*4 = 3,14*8 = 25,12 cm
Answer: length of a circle with a diameter of 8 cm is equal to 25.12 cm