Question

5. The Total Surface Area of a cube is 864cm. Find its length
6. A tank which is cuboidal in shape, has volume 6.4m, length and breadth of the
base are 2m and 1.6m respectively. Find the depth of the tank.​

Answer 1

Step-by-step explanation:

5.For cube:

Total surface area of cube=864 sq.cm

$total \: surface \: area \: of \: cube = 6 {l }^{2} \\ 864 = 6 {l}^{2} \\ {l}^{2} = \frac{864}{6} \\ {l }^{2} = 144 \\ l =12cm$

Answer 2

Answer:

1408 litres

Step-by-step explanation:

Interior diameter of a tank=1.6m

its radius=0.8m

its depth=0.7

volume of tank= pie r²h

=22upon7×0.8×0.8×0.7

=22×0.8×0.8×0.1

=1.408m³

= 1408 litres (1m³=1000 litres)

the tank hold 1408 litres of water.