Question

Q18. Case study 2

In the diagram, a crane ABCD carries a load E. LABC = 60o

, LACB = 90o

, LACD= 45o

LCAD= 90o

, BC= 9 m and DE = 5 m. [ Use √3=1.7and √ = 2.4]

Answer the following questions:

(i) Length of the side AC be :

(a) 13.3 m

(b) 14.3 m

(c) 15.3 m

(d) None of the above

(ii) Length of the side DC be:

(a) 21.6 m

(b) 17.34 m

(c) 23.45m

(d) None of the above

(iii) cosec L BAC is equal to

(a) ½

(b) 2

(c) 0

(d) None of the above

(iv) sec L ADC is equal to

(a) √3/2

(b) 1/2
(c) √2

(d) 2​​

Answer 1

Answer:

good but sec L ADC is equal to

1/2

Answer 2

Answer:

1. A .non of the above
2. 17.34
3. 2
4. 1/2