Question 618782
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Hi
A pool with a circumference of 50 feet is surrounded by a patio by a patio that is 4 feet wide around. 
Find the radius of the pool and the patio combined. 4 + 7.96 = 11.96ft
 {{{2*pi*r = 50}}} {{{r[SP] = 25/pi = 7.96}}}
{{{A[P] = pi*(11.96)^2 - pi*(7.96)^2}}}