SSC CHSL 7 Mar 2018 Shift 3 Paper

Section: English Language

Question : 25 of 100

Marks: +1, -0

In ΔDEF measure of angle E is 90°. If secD = 25/7, and DE = 1.4cm, then what is the length (in cm) of sideDF?

Solution:

Given : DE = 1.4 cm and sec D =

25/7

To find : DF = ?
Solution : In right ∆DEF,
⇒

sec(D) = {DF}/{DE}

⇒

25/7 ={DF}/1.4

⇒

DF=25/7×1.4=5

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