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20790=22/7×r^2×15
20790/15=22/7×r^2
1386=22/7×r^2
1386×7/22=r^2
441=r^2
21=r
luas selimut
L.selimut=22/7×d×t
L.selimut=22/7×42×15
L.selimut=1980