What CAST means
What does CAST stand for?
What does CAST tell you?
When the values of trig functions are positive or negative.
What should CAST actually be called?
Which region each angle falls in
What region of CAST are acute angles in?
What region of CAST are obtuse angles in?
What region of CAST are small reflex angles in?
What region of CAST are large reflex angles in?
Angle range inequalities
What is the inequality for an acute angle?
\[0^{\circ} < x < 90^{\circ}\]
What is the inequality for an obtuse angle?
\[90^{\circ} < x < 180^{\circ}\]
What is the inequality for a small reflex angle?
\[180^{\circ} < x < 270^{\circ}\]
What is the inequality for a large reflex angle?
\[270^{\circ} < x < 360^{\circ}\]
The CAST diagram
Visualise a CAST diagram?
Which functions are positive in each region
What trig functions are positive for acute angles?
What trig functions are positive for obtuse angles?
\[\sin\]
What trig functions are positive for small reflex angles?
\[\tan\]
What trig functions are positive for large reflex angles?
\[\cos\]
