Angles of elevation and depression
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Angle of elevation definition?
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3.3.14 cards
Angle of elevation definition?
Angle measured upward from horizontal line of sight.
Draw horizontal first, then angle up.
Angle of depression definition?
Angle measured downward from horizontal line of sight.
Horizontal is at observer level.
Why are elevation and depression linked?
They often form alternate interior angles in parallel-line setup.
Use geometry before trig if needed.
IB exam pitfall in elevation questions?
Using vertical line as reference instead of horizontal.
Reference line must be horizontal.
3.3.24 cards
First step in 3D trig problems?
Sketch and isolate a right triangle in 3D shape.
Convert 3D to connected 2D triangles.
How to find space diagonal of cuboid?
Use Pythagoras twice or 3D distance formula.
d = sqrt(l^2 + w^2 + h^2).
Why are bearings often paired with 3D trig?
Need plan view + elevation view for full geometry.
Handle horizontal distance first.
Common error in 3D trig IB questions?
Using wrong triangle for angle asked.
Identify which plane contains the angle.
Topic 3.3 study notes
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