## joachimngeny one year ago A pipe 19 m long and of radius r = 9 cm is to be coated by insulation material to a thickness of δr = 8 mm. Approximate the volume δV of insulation material required in m3. Please use Pi for π (rather than a decimal approximation) in your answer. Insulation volume (m3): ?

1. anonymous

|dw:1443170693245:dw|

2. steve816

Wow, amazing drawing!

3. anonymous

thanks!

4. joachimngeny

is that SR (thickness x Radius) or SV (thickness)?

5. anonymous

in the equation?

6. anonymous

basically the volume of the insulation is the volume of the whole minus the volume of the pipe

7. joachimngeny

thanks i got it using $\frac{ dv }{ dr }.thickness$

8. joachimngeny

great drawing btw