Question

In Fig. 16.19, ABCD is a quadrilateral.
(i) Name a pair of adjacent sides.
(ii) Name a pair of opposite sides.
(iii) How many pairs of adjacent sides are there?
(iv) How many pairs of opposite sides are there?
(v) Name a pair of adjacent angles.
(vi) Name a pair of opposite angles.
(vii) How many pairs of adjacent angles are there?
(viii) How many pairs of opposite angles are there?

Answer 1

$$\begin{gathered} \left(\mathrm{i}\right)(\mathrm{AB},\mathrm{BC})\mathrm{or}(\mathrm{BC},\mathrm{CD})\mathrm{or}(\mathrm{CD},\mathrm{DA})\mathrm{or}(\mathrm{AD},\mathrm{AB}) \\ \left(\mathrm{ii}\right)(\mathrm{AB},\mathrm{CD})\mathrm{or}(\mathrm{BC},\mathrm{DA}) \\ \left(\mathrm{iii}\right)\mathrm{Four} \\ \left(\mathrm{iv}\right)\mathrm{Two} \\ \left(\mathrm{v}\right)(\angle \mathrm{A},\angle \mathrm{B})\mathrm{or}(\angle \mathrm{B},\angle \mathrm{C})\mathrm{or}(\angle \mathrm{C},\angle \mathrm{D})\mathrm{or}(\angle \mathrm{D},\angle \mathrm{A}) \\ \left(\mathrm{vi}\right)(\angle \mathrm{A},\angle \mathrm{C})\mathrm{or}(\angle \mathrm{B},\angle \mathrm{D}) \\ \left(\mathrm{vii}\right)\mathrm{Four} \\ \left(\mathrm{viii}\right)\mathrm{Two} \end{gathered}$$