Respuesta :

a) in 4 hours he can go 4*2 = 8 miles 

and circular area = pie * R^2 = 3.14 * 8 * 8 =200.96 = 201 square miles

in 5 hours , area = pie* 10*10 = 3.14 * 100 = 314 sq mile.

additional area = 314 -201 = 113

hope it helped
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