if my area is 121/pi cm^2 what is my diameter?

Question

thanks for helping me out! I was absent from school because of a field trip plus we had a school lock-down so I did'nt have a chance to learn about circles very much thanks again for all your help

Answer 1

Area = π*r^2, where r is the radius.
You have: 121* π which = π*r^2, so r^2 = 121, which means r = 11.
Since the diameter = 2*r, your diameter = 2*11 or 22cm

Hope this helps!

Answer 2

I'm going to assume that you really mean 121pi, not 121/pi. Since the area of a circle is pi*r^2, we can say:

121pi = (11^2)pi = pi*r^2

So the radius r is 11 cm. The diameter is twice the radius, or 22 cm

Answer 3

Simple math.... really.

Just equate your area to the equation for area and solve for "r."

121/pi = pi r^2
121 = r^2
r= 11

Now, plug "r" into the formula for diameter:
Diameter = 2r

Or, multiply 11 by 2.

...I wish my math homework was this easy...
Would you like to trade? You can try to find distances between particles in 9 dimensional space. The computers help no end!

Answer 4

A=121/π=π*d^2/4 multiply both sides by 4
484/π=π*d^2 divide both sides by π
484/π^2=d^2 take sqrt of both sides
d=22/π cm

unless you meant

A=121 *π, then
121π=π d^2 /4 and
d^2=484
d=22 cm