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Answer :

Answer: 7) 50.27 8) 251.33 9) 235.62 *These answers were calculated using the true value of pi, not 3.14*
using 3.14159 for pi

7) 50.26544
8) 251.3272
9) 235.61925

(i'm not sure if you're rounding to the nearest hundredth or not so i left the numbers as they were)