Find the length of the diameter of the circle if the length of 1/3 of the circumference that bounds the circle is 6.2 cm.

By the condition of the problem, the length of 1/3 of the circle is 6.2 cm.

Then the length C of the entire circle will be 6.2 * 3 = 18.6 (cm).

But the circumference is calculated by the formula C = 3, 14 * D, where D is the diameter of the circle.

the number “Pi”, approximately equal to 3, 14, is rounded to tenths and we get the equation:

3.1 * D = 18.6;

D = 18.6: 3.1;

D = 6 (cm).

Answer; 6 cm.