Question

In ∆ABC angleB =90° and angleC =30°. If AC =18 then AB= ?
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Answer 1

Answer: 9cm

The triangle is right-angled at A

So we know that

angle C = 30°

AC or hypotenuse = 18

so we know that

Sin∅ = opposite/hypotenuse

Sin30° = Opposite/hypotenuse = AB/18

Sin30° = 1/2

1/2 = AB/18

AB = 18/2

AB = 9cm

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