Answer:
The correct option is C.
Step-by-step explanation:
Given information: BCDE is a rectangular casing, DE = 3 cm and BE = 3 cm.
We need to find the smallest diameter of pipe that will fit the fiber optic line. It means we have to find the measure of DB.
The measure of all interior angles of a rectangle or square is 90°.
[tex]\angle DEB=90^{\circ}[/tex]
It means the DEB is right angled triangle.
According to the Pythagoras theorem:
[tex]hypotenuse^2=leg_1^2+leg_2^2[/tex]
In triangle DEB,
[tex](DB)^2=(DE)^2+(BE)^2[/tex]
[tex](DB)^2=(3)^2+(3)^2[/tex]
[tex](DB)^2=9+9[/tex]
[tex](DB)^2=18[/tex]
Taking square root both sides.
[tex]DB=\sqrt{18}[/tex]
[tex]DB=4.24264068712[/tex]
[tex]DB\approx 4.24[/tex]
Therefore the correct option is C.
