Trigonometry Lesson

4 Slides • 4 Questions

1

Trigonometry

2

Sine and cosine rule

Cosine rule:

a^2=b^2+c^2-2bc\ \cos A

Sine rule:

\frac{a}{Sin\ A}=\frac{b}{Sin\ B}=\frac{c}{Sin\ C}

Area of triangle

Area\ =\frac{1}{2}ab\ \sin\ C

3

Cosine rule

Missing side

4

Poll

What would you use here?

Sine rule

Pythagoras

Trigonometry

Cosine rule

5

Poll

Which is the correct rearrangement of the cosine rule?

\frac{ }{ }

$\cos\ A\ =\ \frac{b^2+c^2+a^2}{2bc\ \cos\ A}$

$\cos\ A\ =\ \frac{b^2-c^2-a^2}{2bc\ \cos\ A}$

$\cos\ A\ =\ \frac{b^2+c^2-a^2}{2bc\ \cos A}$

6

Poll

What would you use here?

Sine rule

Pythagoras

Trigonometry

Cosine rule

7

Multiple Choice

Which is the correct equation?

1

2

3

4

8

Area of a triangle (no right angles)

Trigonometry

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