Respuesta :

onekap
The answer is 129 ft squared 
obudat
the area of shaded region = area of big circle - area of small circle

area of big circle = pi x r x r
                             r = 32
                             3.14 x 32 x 32
                             =3215.36ft square

area of small circle = pi x r x r
                               =3.14 x 20 x 20
                               =1256ft square
 = 3215.36 - 1256
 =1959.36ft square
 = 1959ft square

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