2.50 = pi r2. i really need on this problem.

r = 0.8923

Step-by-step explanation:

pi = 3.14

2.50 = 3.14 * r^2                      Divide by 3.14

2.50/3.14 = 3.14*r^2 / 3.14

.7962 = r^2                               Switch

r^2 = 0.7962                             Take the square root of both sides.

sqrt(r^2) = sqrt(0.7962)            

r = 0.8923                                 Answer  

I don't know where you are getting stuck. Maybe it's finding the square root. You can do that on almost any calculate by

Perhaps it is the value of pi. The usual approximation is 3.14. Take that as your value.

c

step-by-step explanation:

i found two solutions,   n = 2 • ± √3 = ± 3.4641

step-by-step explanation: