A pair of opposite sides of a trapezium are ________.

An angle greater than 180° and less than a complete angle is called ______.

The number of diagonals in a hexagon is _____.

In Fig. 2.14, points lying in the interior of the triangle PQR are ______, that in the exterior are ______ and that on the triangle itself are ______.

In Fig. 2.15, points A, B, C, D and E are collinear such that

AB = BC = CD = DE. Then

(a) AD = AB + ____

(b) AD = AC + ____

(c) mid-point of AE is ____

(d) midpoint of CE is _____

(e) AE = _____ × AB.