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1540 =
1 meter = 10 dm
a. Volume = Luas x Tinggi
Luas alas = Volume/Tinggi
=1540/10
=154 dm²
b. Luas = phi r²
r²=Luas/phi
= 154/(22/7)
=154 x 7/22
=1078/22
=49 dm
r = √49=7
Luas Selimut = 2 phi r t
= 2 x 22/7 x 7 x 10
=440 dm²
c. Luas permukaan tanpa penutup
= luas alas + luas selimut
= 154 + 440
= 594 dm²