CPM Homework Help : CCA2 Problem 5-79

Consider the function defined by inputs that are the lengths of the radii of a circle, and outputs that are the areas of those circles. Write the equation for this function and investigate it completely.

Hint:

Begin by making a table. Let $x$ be the radius. Let $y$ be area.

More Help 1:

Choose several values of $r$ . The area of a circle is $A=\pi r^2$

More Help 2:

Your investigation should include at least:
An equation in terms of $x$ and $y$
A graph
Domain and Range
A description of the growth

What else does your class list for Investigating a Function include?

Answer:

$y=\pi x^2$