Why does a circle have an infinite number of lines?

What is the international language of science? What is the circumference of an 7cm circle? What is the circumference of a circle with a diameter of 18 in.? If a Pencil is 5cm long how many times would it fit on a meter stick? Which is more 288 inches or 8 yards? 2x equals 28 x equals? What are the rules for the multiplying and dividing integers? What are the next three terms in the given sequence 90766248? How miles is 4838 feet? If you were born on the 21 April 1999 how old will you be? What are the use of differential equation in dialy life? What is 3 over 1 divided by 30 equal to? What is the relationship between the length of daylight and the Suns angle? What is 510.642 in word form? A shape with 3 sides? What does the word implication means? How do you convert 30 lbs to kilo per hour? What are extraneous and confounding variables? What is the percent of 11 out of 5? What function of ic 4808?