The trigonometric concepts you have learned so far is often applied to solve $3$-D problems. Let’s

Question

The trigonometric concepts you have learned so far is often applied to solve $3$-D problems.
Let’s recall all the trigonometric concepts you have learned thus far.

RIGHT-ANGLED TRIANGLES

Trigonometric Ratios: TOA CAH SOH
Pythagoras Theorem

ANY TYPES OF TRIANGLES

Sine Rule
Cosine Rule

The technique is to

If the degree of accuracy is not specified in the question, and if the answer is not exact, correct to $3$ significant figures. Answer in degree, give to $1$ decimal place.

Accepted Answer

Use trigonometric ratios or Pythagoras' theorem for right-angled triangles, and the sine or cosine rule for non-right-angled triangles. Reduce a $3$-D problem to suitable $2$-D planes. Unless otherwise stated, give non-exact answers to $3$ significant figures and angles to $1$ decimal place.

Trigonometry - Trigonometry in Two and Three Dimensions

Trigonometry - Trigonometry in Two and Three Dimensions

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