MCQ
In the adjoining figure, if $m \| n$, then $\angle4+\angle7$ is equal to:
- ✓$180^\circ$
- B$120^\circ$
- C$90^\circ$
- D$150^\circ$
✓
Answer
Correct option: A.
$180^\circ$
$\angle1=\angle5$ (Corresponding angle)
$\angle7=\angle5$ (Vertically Opposite angle)
$\angle4+\angle1=180^\circ$ (Linear Pair)
$\angle4+\angle7=180^\circ$ (From above equations).
$\angle7=\angle5$ (Vertically Opposite angle)
$\angle4+\angle1=180^\circ$ (Linear Pair)
$\angle4+\angle7=180^\circ$ (From above equations).
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