Area of a circle

The topic  appears under the 7th Grade Math Mission. This exercise practices the relationship between radius, diameter, circumference and area.

Types of Problems
There is one type of problem in this exercise:


 * 1) Find the requested measure from the given one: This problem gives either the radius, diameter or circumference of a circle. The student is asked to find one of the other measures.Aoac1.png

Strategies
Knowledge of the four basic circle constants is an advantage on this exercise.
 * 1) The circle constants are radius, diameter (which is twice the radius), circumference (which is 2 \pi r or also \pi d) and the area formula (which is \pi r^2, though not needed on this exercise.
 * 2) The circumference formula can be remembered with the mnemonic "Cherry pies are delicious."
 * 3) The area formula can be remembered with the mnemonic "Apple pies are too."
 * 4) All four circle constants can be listed with the acronym CARD.