the triangle and it's properties formula
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(i)The sum of the three interior angles of a triangle is 180°.
(ii)The sum of an interior angle and the adjacent exterior angle is 180°.
(iii)Two exterior angles having the same vertex are congruent.
Triangle Formula: The area of a triangle ∆ABC is equal to ½ × BD × AC = ½ × 5 × 8 = 20.
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