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Answer:
I will try my best to answer
length of pipe= 30m
Inside dia. = 1.2m
Outside dia. = 1.8m
Volume of concrete= (outside dia. - inside dia.)h
V= (pi)v= [(3.14*0.9*0.9)-(3.14*0.6*0.6)]30
v= (3.3534-1.1304)30v=(2.233)30 = 66.690m cube
since it's volume the answer 66.690 is in cubic meters.
9
Step-by-step explanation:
12-3=9