Question

If one of the angles of a parallelogram is 100°, then the other non-adjacent angle is .

• A. 180°
• B. 100°
• C. 80°

Answer 1

The correct option is B 100°


Consider parallelogram ABCD.
If $\angle ABC={100}^o,$ its non-adjacent angle is $\angle CDA.$

In a parallelogram, the opposite angles are equal.

Here, $\angle ABC$ and $\angle CDA$ are opposite angles.
$\Rightarrow$ $\angle ABC=\angle CDA={100}^{\circ }$