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tinggi = 1,4 m = 14 dm
volume = luas alas x tinggi
7.040 = luas alas x 14
luas alas = 7.040/14
luas alas = 3.520/7
luas alas = phi x r x r
3.520/7 = 22/7 x r x r
3.520 = 22 x r x r
r x r = 3.520/22
r x r = 160
r = 4akar 10 dm
agak ragu, tp smga benar