Q1 of 23 Page 1

Solve any five sub-questions:

In the following figure in ΔABC, ∠B = 90°, ∠C = 60°, ∠A = 30°, Ac = 18 cm. Find BC.


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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