Working out micrometres by using image Watch

1. Hey, i'm stuck on this one question:
Calculate the maximum length of this chloroplast in micrometres. Show your working.
The magnification given was x30000 and i measured the diagram to be 55mm.
What i've done so far is converting 55mm into micrometres which is 55000 then i divided that by the magnification and got 1.83 micrometres.
I don't know if that's right??
Thanks for the help
2. It's spot on dear chap. The triangle for the calculation (O above AxM) looks like the sun (O) is on top of the "AM" like a clock or something.

(where O is observed size, A is actual size, M is magnification)
3. (Original post by Flying Cookie)
It's spot on dear chap. The triangle for the calculation (O above AxM) looks like the sun (O) is on top of the "AM" like a clock or something.

(where O is observed size, A is actual size, M is magnification)

Thank you for the help and the advice!!

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Updated: January 18, 2015
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