i. Isomagnetic charts: Magnetic maps drawn by joining places with the same value of a particular element are called isomagnetic charts.
ii. Isodynamic lines: Lines joining the places of equal horizontal...
Correct option is (C) Parallelogram
In parallelogram
(i) Opposite angles are equal but adjacent sides may not be equal.
(ii) Opposite sides are equal but adjacent sides may not be equal.