Please choose the correct solution to the question: how to find the circumference of a circle

Solution1: The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.    If a circle has a diameter of 4, its circumference is 3.14*4=12.56.    If you know the radius, the diameter is four times as large.

Solution2: The circumference of a circle can be found by multiplying pi ( π = 3.14 ) by the diameter of the circle.    If a circle has a diameter of 4, its circumference is 3.14*4=12.56.    If you know the radius, the diameter is twice as large.

Answer format: solution1/solution2