A rectangle is 48 cm long and 14 cm wide. If the diagonal makes an angle θ with the longer side, then what is (sec θ + cosec θ) equal to?

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CDS Maths Previous Paper 9 (Held On: 2 Feb 2020)
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  1. \(\frac{{775}}{{168}}\)
  2. \(\frac{{725}}{{168}}\)
  3. \(\frac{{375}}{{84}}\)
  4. \(\frac{{325}}{{84}}\)

Answer (Detailed Solution Below)

Option 1 : \(\frac{{775}}{{168}}\)
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Detailed Solution

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Given:

A rectangle is 48 cm long and 14 cm wide

Formula Used:

sec θ = Hypotenus/Base

cosec θ = Hypotenus/Perpendicula

Pythagorus theorem

(Hypotenus)2 = (Perpendicular)2 +(Base)2

Calculation:

F2 Ashish.K 26-05-2020 Savita D4

Triangle ABC is right angle triangle:

Hypotenuse = AC = x = \(\sqrt {{{48}^2} + {{14}^2}} = \sqrt {2304 + 196} = \sqrt {2500}\) = 50

Here,

Sec θ = AC/AB = 50/48

Cosec θ = AC/BC = 50/14

Hence,

(sec θ + cosec θ) = (50/48) + (50/14) = 1550/336 = 775/168 

∴ The value sec θ + cosec θ of is 775/168

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