Page 51 - modul trigonometri_Neat

Example 4.1

Known triangle ABC with length BC = 12 cm, value sin = 0,36 and
sin = 0,9. Determine the length of the AC.

Alternative Solutions

Use the sine rule on the ABC triangle.

= =
sin sin sin

⇔ =
sin sin
12
⇔ =
0,36 0,9

12
⇔ = × 0,9
0,36

100 9
= 12 × ×
36 10
10
= 12 × = 30
4

So, the length of the air conditioner is 30 cm

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