2. Draw a regular and an irregular octagon and mark all its interior and exterior angles.
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In the adjoining figure of an equilateral triangle ABC there are three sides i.e., AB, BC and CA are equal and there are three angles i.e., ∠ABC, ∠BCA and ∠CAB are equal.
Therefore, an equilateral triangle is a regular polygon.
In the adjoining figure of a scalene triangle ABC there are three sides i.e., AB, BC and CA are unequal and there are three angles i.e., ∠ABC, ∠BCA and ∠CAB are unequal.
Therefore, a scalene triangle is an irregular polygon.
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