Angles of Elevation and Depression (VCE SSCE General Mathematics): Flashcards

Angle from horizontal upward to view object above

Angle from horizontal downward to view object below

They are equal (alternate angles)

Alternate angles on parallel horizontal lines

$0°$ to $90°$

$\tan \theta = \frac{\text{opposite}}{\text{adjacent}}$

$\sin \theta = \frac{\text{opposite}}{\text{hypotenuse}}$

Know or need opposite and adjacent sides

Know or need opposite side and hypotenuse

Solve one triangle first for common side, then use in second