In the adjoining figure:

(a) Name:

(i) parallel lines.

(ii) all pairs of intersecting lines.

(iii) concurrent lines.

(b) State whether true or false:

(i) points A, B and D are collinear.

(ii) lines AB and ED intersect at C.

In context of the adjoining figure, state whether the following statements are true (T) or false (F):

(i) Point A is in the interior of ∠AOD.

(ii) Point B is in the interior of ∠AOC.

(iii) Point C is in the exterior of ∠AOB.

(iv) Point D is in the exterior of ∠AOC.

In context of the adjoining figure, name

(i) all triangles

(ii) all triangles having point E as common vertex.