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20. Luas Lingkaran1/4.πr.r
= 3/4 . 22/7. 28.28
=1848
21. πr.r
= π. 10.10
= 100 . 3,14 = 314
= 314 x 25.000 = 7.850.000
22. 2(pl) + 2(pt) + 2(lt)
= 2(15.5 ) + 2 ( 15.11 ) + 2( 11.5 )
150 + 330 + 110 = 590
23. V tabung = L alas x T tabung
L = πr.r = 22/7. 14.14 = 616
616 x 25 = 15.400