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21. 128 cm2
22. 70 cm
v=phi r^2.t
9420=3,14. 10^2 .t
9420=314.t
t=30
21. bangun segitiga siku2nya d gabung, sehingga membentuk persegi panjang dg p=16, l=8
L=p.l=16.8=128