11. Applications of Trigonometry

11.01 Pythagoras' theorem

11.02 Trigonometry ratios

11.03 2D Applications of Trigonometry

11.04 Trigonometry in 3D

11.05 Trigonometry of obtuse angles

11.06 Sine rule

11.07 Cosine rule

11.08 Right angled and non-right angled triangles

INVESTIGATION: Triangle inequality

11.09 Circles, sectors and arc length

VCE 11 General 2023

11.05 Trigonometry of obtuse angles

Interactive practice questions

Is this angle acute, obtuse or reflex?

Two rays intersect at a point. The angle at their intersection is labeled with a blue arc marking. The angle with the blue arc marking is not labeled with its measure but appears to be less than $90^\circ$90°.

obtuse

A

reflex

B

acute

C

Easy

< 1min

Is this angle acute, obtuse or reflex?

Easy

< 1min

Is this angle acute, obtuse or reflex?

Easy

< 1min

Classify the following angles as straight, reflex or a revolution.

Easy

< 1min

Outcomes

U2.AoS4.3

the definition of sine and cosine for angles up to 180°

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