English

(a) For the given figure, which of the following conditions is true:

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Question

For the given figure, which of the following conditions is true:

The image displays a right-angled triangle with a right angle at vertex $A$, points $A, B, C, D$ along the vertical side, and rays extending from vertex $O$ forming angles $\alpha, \beta, \text{ and } \gamma$.

Options

  • cot γ < cot β

  • cot γ > cot α

  • cot β > cot α

  • cot β < cot γ

MCQ
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Solution

cot γ < cot β

Explanation:

From figure,

\[\cot \alpha = \frac{OA}{AB}\]

\[\cot \beta = \frac{OA}{AC}\]

\[\cot \gamma = \frac{OA}{AD}\]

Since, \[AB < AC < AD\]

∴ \[\cot \gamma < \cot \beta < \cot \alpha\]

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Chapter 21: Trigonometrical Identities - TEST YOURSELF [Page 340]

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Selina Concise Mathematics [English] Class 10 ICSE
Chapter 21 Trigonometrical Identities
TEST YOURSELF | Q 1. (a) | Page 340
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