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प्रश्न
Length of AB is equal to ______.
विकल्प
`20sqrt3 cm`
`20/sqrt3 cm`
20 cm
none of these
MCQ
रिक्त स्थान भरें
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उत्तर
Length of AB is equal to `bbunderline(20sqrt3 cm)`.
Explanation:
Angle at D is 30°, so angle ACB = 60°.
In right triangle ACB, tan60 = `"AC"/"CB" = sqrt3`, hence AC = `20sqrt3`.
AB is vertical equal to AC, so AB = `20sqrt3`.
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