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Question
In ΔABC, ∠B = 90°, ∠C = 30°, AC = 12 cm, then find AB.
Sum
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Solution
∠B = 90°, ∠C = 30°
∴ ∠A = 60° ...(The remaining angle of △ABC)
∴ △ABC is a 30° − 60° − 90° triangle
AB = `1/2` AC ... (Side opposite to 30°)
∴ AB = `1/2 xx 12` cm
∴ AB = 6 cm
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