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= 22/7.21.21
=1386 m²
10.
L= pi.r.r
1,54 dm²= 22/7.r.r
154cm²=22/7.r.r
154.7/22= r.r
49= r.r
r= 7
D= r.2
=7.2
=14
Maaf kalau ada yg salah :) Jadikan terbaik ya!