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686 = r.r .14
49 =r.r
9 = r
lp = 2 .3,14 .9 (9+14)
lp = 56,52(23)
lp = 1299,96
2156 = 22/7 x r² x 14
r²= 2156 :44
r²= 49........r = 7
Luas Permukaan = 2 n r (r + t)
= 2 x 22/7 x 7 (7 + 14)
=44 x (21)
= 924