We used some five measurements to draw quadrilaterals so far. Can there be different sets of five measurements (other than seen so far) to draw a quadrilateral? The following problems may help you in answering the question.
(i) Quadrilateral ABCD with AB = 5 cm, BC = 5.5 cm, CD = 4 cm, AD = 6 cm and ∠B = 80°.
(ii) Quadrilateral PQRS with PQ = 4.5 cm, ∠P = 70°, ∠Q = 100°, ∠R = 80° and ∠S = 110°.
Construct a few more examples of your own to find sufficiency/insufficiency of the data for construction of a quadrilateral.
Construct the kite EASY if AY = 8 cm, EY = 4 cm and SY = 6 cm (figure below) Which properties of the kite did you use in the process?
Following properties have been used in constructing the KITE:
(i) Diagonals are at right angles.
(ii) One of the diagonal bisects the other.
(iii) Pairs of consecutive sides are equal.
Steps of construction:
I. Draw a line segment AY = 8 cm.
II. Draw , the perpendicular bisector of AY such that it meets AY at O.
III. We cannot locate a point E on PQ at 4 cm from Y and A, i.e. EY = 4cm = EA is not possible. It is possible only When E and O coincide. In that case the kite does not exist.