In Fig. 5.49, AB||CD, AF||ED, ∠AFC = 68° and ∠FED = 42°. Find ∠EFD.

Iron rods a, b, c, d, e and f are making a design in a bridge as showing Fig. 5.47, in which a ||b, c ||d, e || f. Find the marked angles between

(i) b and c (ii) d and e

(iii) d and f (iv) c and f

Amisha makes a star with the help of line segments a, b, c, d, e and f, in which a || d,b || e and c || f. Chhaya marks an angle as 120° as shown in Fig. 5.48 and asks Amisha to find the ∠x, ∠y and ∠z. Help Amisha in finding the angles.

In Fig. 5.50, OB is perpendicular to OA and ∠BOC = 49°. Find ∠AOD.

Three lines AB, CD and EF intersect each other at O. If ∠AOE = 30° and ∠DOB = 40° (Fig. 5.51), find ∠COF.