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9. L=π*r.*r
=22/7*21/2*21/2=itu 7 dengan 21 dicorek dan 2 dengan 22juga dicorek
=693/2 = 346,5
10. gak jelas
11. gak jelas
12. gak jelas
13. L = 1/2*a*t*tp
=1/2*18*12*42= 2 dengan 9 coret
=4236 hitung lagi y
14. 4000:1000=4*60 =240
15. V=π*r*r*t
=22/7*14*14*28
=17248
16. 50*1000 = 50000
maaf!!