Maths - CAST

Created: December 03, 2020
Updated: August 24, 2024

What does CAST stand for?
  • Cosine
  • All
  • Sine
  • Tan

What does CAST tell you?

When the values of trig functions are positive or negative.

What should CAST actually be called?

ASTC

What region of CAST are acute angles in?

A/All.

What region of CAST are obtuse angles in?

S/Sin.

What region of CAST are small reflex angles in?

T/Tan.

What region of CAST are large reflex angles in?

C/Cos.

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?
\[270^{\circ} < x < 360^{\circ}\]

Visualise a CAST diagram?

PHOTO CAST

What trig functions are positive for acute angles?

All of them.

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?
\[\cos\]


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