## Pi

• Why should I bother learning this?
Knowing when to use a formula, what formula to use, and how to use a formula correctly are critical factors. Formulas are quite prevalent in mathematics and science because they can save a lot of time and effort. If students understand how a formula is derived, it will help them remember the formula.

• Is there any relationship between the area of a circle and the circumference of a circle?
Unlike rectangles, there is a relationship between the area of a circle and its circumference. If you know the radius, diameter or circumference of a circle, you can compute the area of a circle. As the radius or diameter of a circle increases, so does the circumference and the area of the circle.

• Does equal 3.14?
No, it doesn't equal 3.14 exactly, but it is very close to that value. Pi is what mathematicians call an irrational number, which means its decimal equivalent never repeats or terminates. The value of 3.14 is a good approximation to , and so is the fraction . Tell your students that they will study more about irrational numbers in high school. Have your students look up more on the Internet about the number pi.