tolong jawab isi cara

16. =1/2 x phi(22/7) x r x r

=1/2 x phi(22/7) x 14 x 14

(1/2 x 14) x (22/7 x 14)

=(1/2 x 14 = 14 : 2 = 7)

=(22/7 x 14 = 44)

=44 x 7 = 308cm(A.)

17. =2 x phi(22/7) x r

=2 x phi(22/7) x 28

=22/7 x 28 = 88

=88 x 2 = 176meter(A.)