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sector area is a/360 * pi r^2

the formula is central angle/2pi = A /pir^2.

so what he said above me.

you're *

a/2pi = 8/36pi
a/pi = 4/36pi
12.56 = 113a
a = 9
according to marcs formula so yeah :)

Yep, well i'm only in geometry and we did stuff like this. but it's different working backwards.

Id say more here but this isnt a conversation area :) haha