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C2 exam tomorrow help meee!

Ok so im the most unorganised person ever!!

Ive lost my notes for my c2 exam tomorrow and cannot remember some of the formulas :frown:

Can any body help me with the following:
the main formulas for triangles
main formulas for circles
i also struggle with range of values for x.. i remember the formula sinx/cosx = tanx but cant remember the other one!!

Please help if you know these topics!!

:frown:

Reply 1

4ever_drifting

Triangles - sine rule: sina/a=sinb/b (can be swapped around depending on what you're trying to find.
cosine rule: a^2=b^2+c^2-2bc cos a (may need to be rearranged if you're finding the angle a from 3 sides). Remember with both these rules and any other trig if you need to find an angle use the tan/cos/sin^-1.

With circles I'm guessing you mean the segmentsand stuff?
Perimeter of a segment=Pi*d*(angle/360) (or angle/2pi if in radians)
Area of a segment=Pi*r^2*(angle/360) (or 2pi) - both of these may need to be rearranged, depending on the information you're given.

The other identity you're looking for is sin^2 x+cos^2 x=1

Hope this helps, and good luck!!