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Question

If secC is m22, then m is:


A

1

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B

3

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C

7

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D

none of these

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Solution

The correct option is B

3


Explanation for the correct option:

Compute the required value:

From the fig, BDC is a right-angled triangle. Using Pythagoras theorem,

DC2=122-42=144-16=128DC=128=82

Now, secC = hypotenuse /adjacent side.

secC=BCDCsecC=1282secC=322

Given: secC=m22

m22=322m=3

Hence, option B is the answer.


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