Answer:
On copying the triangles on squared paper, we get the following figures: (a) Here, the given triangle is an isosceles right angled triangle and one angle is \[{{90}^{o}}\] and its line of symmetry is \[{{l}_{1}}\]. (b) Here, the given triangle is an isosceles triangle and its line of symmetry is \[{{l}_{1}}\]. (c) Here, the given triangle is an isosceles right angled triangle and one angle is \[{{90}^{o}}\] and its line of symmetry is \[{{l}_{1}}\]. (d) Here, the given triangle is scalene triangle. So, this is not the symmetrical figure. Therefore, there is no line of symmetry.
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