Answer :

The triangle ABC is as follows:

We can apply the trigonometry here.

sin θ = Opposite side / Hypotenuse

Here θ = 30°

Opposite Side to 30° = BC

Hypotenuse is side opposite to 90° = 18 cm

sin 30° = 1/2

BC = 18 / 2

∴ BC = 9cm.

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