alleryStart learning →$\cos A$ for an acute angle $A$ is defined as
A$\dfrac{\text{opposite}}{\text{hypotenuse}}$
B$\dfrac{\text{adjacent}}{\text{hypotenuse}}$
C$\dfrac{\text{adjacent}}{\text{opposite}}$
D$\dfrac{\text{hypotenuse}}{\text{adjacent}}$
Answer & Solution
Correct answer: B. $\dfrac{\text{adjacent}}{\text{hypotenuse}}$
1. $\cos A$ is the ratio of the adjacent side to the hypotenuse.
2. $\cos A = \dfrac{\text{adjacent}}{\text{hypotenuse}}$.
3. Its reciprocal is $\sec A$.
_Source: Karnataka SSLC (KSEEB) Class 10 Mathematics, Ch11 'Introduction to Trigonometry', §11.1_
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