In a right-angled triangle $A B C$ with $∠ C = 90^{o}$ and $∠ A = 2 ∠ B, ∠ B$ is

15^{o}

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60^{o}

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45^{o}

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30^{o}

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Solution

The correct option is D $30^{o}$
$∠ C = 90^{o} o r ∠ A + ∠ B = 90^{o}$
$B u t 2 ∠ B + ∠ B = 90^{o}$
$∴ ∠ B = 30^{o}$

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Similar questions

△ A B C, ∠ A = 90^{o}, ∠ B = 60^{o}, ∠ C = 30^{o}

∠ A - ∠ B = 15^{o}

∠ B - ∠ C = 30^{o}

∠ A, ∠ B

∠ C

△ A B C, ∠ B = 90^{o}, ∠ A = 45^{o} = ∠ C

sec 45^{o} =

∠ A = 60^{o}, ∠ B = 90^{o}, ∠ C = 30^{o}

△ A B C, ∠ B = 90^{o}, ∠ A = 45^{o} = ∠ C

c o s e c 45^{o} =

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