1. What are co - joined angles ?

2. Define : a) Betweenness b) Half - plane c) Vertex of an angle d) Arms of an angle

3. Explain pairs of alternate interior angles .

1.

Co-joined angles: the consecutive angles are known as conjoined angles. in the parallelogram sum of conjoined angles are supplementary.

2.

 Half Plane : A half plane is a planar region consisting of all points on one side of straight line, and no points on the other side.

 Vertex of an angle: the point about which the angle is measured , is known as vertex of an angle.

Arms of an angle: two straight sides about which angle is measured is called as ams of an angle. 

pair of alternate interior angles: when a transversal intersects two parallel lines, pair of angles which are inside the parallel lines and 

on the opposite sides of the transversal is known as a pair of alternate interior angles.

(4, 6) and (3,5) are the pair of interior angles.

hope this helps you.

cheers!!

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