UPSKILL MATH PLUS

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Where $$|$$ and $$||$$ denotes equal sides.
• Opposite angles are equal. (Angles $$A$$ and $$D$$ are same and angles $$B$$ and $$C$$ are same.)
• Angles "$$A$$" and "$$C$$"  or "$$B$$" and "$$D$$" add up to $$180°$$ so that they are supplementary angles. (For example, Two angles ($$140°$$ and $$40°$$) are supplementary angles because they add up to $$180°$$).