7.3

Height = 10cm

Diameter = 20.3cm

r= d/2 r = 20.3 / 2

r = 10.5cm

v = π x r x r x h

v = 3.14 x 10.15 x 10.15

v = 323.49cm2

v = 323.49 x 10

v = 3234.9cm3

7.4

Height = 10m

Diameter = 0.8 (inside) and 1 (outside)

Inside -

r = d/2

r = 0.8/2

r = 0.4

v = π x r x r x h

v = 3.14 x 0.4 x 0.4 x h

v = 0.5 x 10

v = 5m

Outside -

r = d/2

r = 1/2

r = 0.5

v = π x r x r x h

v = 3.14 x 0.5 x 0.5 x h

v = 0.78 x 10

v = 7.8m

I tried to look for the volume of the concrete to build the Culvert. I basically just took the volume from the inside, and subtracted it from the volume in the outside.

7.8 - 5m = 2.8m3

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