trixx
Does anyone know how to use set squares to measure the diameter of something?

Diameter? Are you sure you mean a set square? I can't imagine it would be very useful to measure the diameter of something!
I got this from an examiner's report (edexcel) but i can't find any info on how to do this.
trixx
I got this from an examiner's report (edexcel) but i can't find any info on how to do this.

Hmm. Just guessing here, but how about putting your cylinder on a table on its side, and using the set square against the table to measure the highest point. lol can't see it being very useful!
Thanks anyway. A bit slow in here today. someone who knows might come along later.
trixx
Does anyone know how to use set squares to measure the diameter of something?

put two of the corners of the set square (call these A and B with the right angle of the set square at B) on a circle and then the other edge BC (extended if necessary) leads to the point diametrically opposite A

this is because a diameter subtends a right-angle in a semicircle
yeah, but surely that only works if u're circle is big enough? Clever way of doing it tho!
RichE
put one two of the corners of the set square (call these A and B with the right angle of the set square at B) on a circle and then the other edge BC (extended if necessary) leads to the point diametrically opposite A

huh?
franks
yeah, but surely that only works if u're circle is big enough? Clever way of doing it tho!

well one of the sides of the set square has got to be less than a diameter I grant you
trixx
huh?

there was a typo - should have said "put two of the corners..."
RichE
there was a typo - should have said "put two of the corners..."

O ok. Thanks
Was this from the May 2002 PHY5 paper- the one with the cans? (or something like that). Cos we were doing this in school today.
Anyway, here's a diagram (hopefully it's self-explanatory):
mockel
Was this from the May 2002 PHY5 paper- the one with the cans? (or something like that). Cos we were doing this in school today.
Anyway, here's a diagram (hopefully it's self-explanatory):

Thank you so much.