Question

In the given figures below, decide whether $l$ is parallel to $m$.

Answer 1

(i) $126\degree + 44\degree = 170\degree$
$l$ is not parallel to $m$ because sum of interior opposite angles should be $180\degree$.

---

(ii) $75\degree + 75\degree = 150\degree$
$l$ is not parallel to $m$ because sum of angles does not obey the property of parallel lines.

---

(iii) $57\degree + 123\degree = 180\degree$
$l$ is parallel to $m$ due to supplementary angles property of parallel lines.

---

(iv) $98\degree + 72\degree = 170\degree$
$l$ is not parallel to $m$ because sum of angles does not obey the property of parallel lines.