A trampoline has an area of 49 pie square feet. What is the diameter of the trampoline?

We know that formula for the area of the circle is / pi r^2 and this area is equal to 49.

We can make such equation

/pi r^2=49

For simplification we canassume pi=3

3r^2=49 / : 3 divide both sides by 3

r^2=16.3 / sqrt{both sides}

r = / sqrt{16.3}

r=4.04

We know that diameter is equal 2 times radius, so diameter=2*4.04=8.08 - its the answer