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55=11000
11000/55
t=200 cm
luas alas = kel.lingkaran
55=2 pi r
55=2x22/7xr
55=44/7xr
55x7=44 x r
385=44 x r
r=385/44
r=8,75cm
diameter= 2 x r
d=2 x 8,75
d=17,5 cm
semoga membantu ;-)