Answer: 1.4 cm
Step-by-step explanation: In this problem, we're given the circumference of a circle and we're asked to find the radius.
So let's use the formula for circumference
that involves the radius which is C = 2πr.
Since we know the circumference is 9 centimeters,
we plug 9 centimeters in for the circumference in
our formula and we have <em>9 cm = 2πr</em>.
Next, we know that π is approximately 3.14 do we can
plug 3.14 in for π and we have <em>9 cm = 2(3.14)r</em>.
Now, to find the radius of the circle,
we simply solve this equation for <em>r</em>.
Simplifying on the right side, 2(3.14)
is 6.28 and we have <em>9 cm = 6.28r</em>.
Finally, we divide both sides of the
equation by 6.28 to get <em>1.4331 = r</em>.
Rounding to the nearest tenth, we get 1.4.
So the radius of the circle is 1.4 cm.
