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t : 10 cm
Dit : Luas selimut ?
jwb :
k : 2 x phi x r
2 x 22/7 x r
22 : 44/7 x r
r : 22 x 7/44 = 3,5
jadi luas selimut :
2x22/7x3,5x10
= 2x22/7x35
= 220 cm2