Moment of Inertia textbook workings don't make sense.

[Luk-e-2012]

Homework Statement

Question is about buckling, so i know i need to work out I (moment of Inertia), which is for a hollow tube.

Homework Equations

So the paper states..I = (0.08^4 - 0.06^4)∏/64 = 1.37 x 10^-6 m4

When i do that on my calculator, i don't get this answer. Puzzled...

 

[SteamKing]

The answer is correct.

Probably mispunched a number. If you don't get the right resultinitially, try the calculation again.

 

[Luk-e-2012]

What a plonker i am, i have been doing 0.08 x10^4 instead of 0.08^4 .. Can you tell i have just started studying again since school.
Thanks SteamKing - look out for more amateurish questions coming your way..haha.