Practice Flashcards
State SOH-CAH-TOA.
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All Flashcards in Topic 3.2
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3.2.14 cards
State SOH-CAH-TOA.
sin = opp/hyp, cos = adj/hyp, tan = opp/adj
Works in right-angled triangles only.
When should you use inverse trig?
When angle is unknown and side ratio is known.
Use sin^-1, cos^-1, tan^-1 on GDC.
Which side is opposite theta?
The side directly across from angle theta.
Mark theta clearly before choosing ratio.
Common trig mistake in IB Paper 1?
Using wrong ratio due to side mislabelling.
Label opposite, adjacent, hypotenuse first.
3.2.24 cards
When is sine rule typically used?
When you have AAS, ASA, or SSA triangle data.
Match side-angle opposite pairs.
When is cosine rule typically used?
When you have SAS or SSS triangle data.
Great for finding unknown side first.
Cosine rule for side a?
a^2 = b^2 + c^2 - 2bc cos A
Angle A is opposite side a.
Ambiguous case in sine rule means?
SSA data can produce two possible triangles.
Check if 0, 1, or 2 triangles fit.
Topic 3.2 study notes
Full notes & explanations for 2D and 3D trigonometry
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