
A.
(frac{5}{17}) 
B.
(frac{8}{17}) 
C.
(frac{8}{15}) 
D.
(frac{12}{17})
Correct Answer: Option A
Explanation
ABCD is the floor, by pythagoras
AC^{2} = 144 + 81 = (sqrt{225})
AC = 15cm
Height of room is 8m, diagonal of floor is 15m
∴ The cosine of the angle which a diagonal of the room makes with the floor is EC^{2} = 15^{2}
cosine = (frac{text{adj}}{text{hyp}}) = (frac{15}{17})