Question

a) Is it possible that there are three sides common between triangle and
quadrilateral:
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Answer 1

Answer:

yes of course it is possible

Answer 2

Answer

Both triangles and quadrilaterals are closed plane figures made of straight lines. Both have 3 or more straight sides and 3 or more angles. Also the area formula is kind of similar. Traiangle = (1/2)BH, But in quadirilateral the formula does not have '1/2' in it, Quadilateral= BH. Triangles equal 180 degrees  and Quadrilateral equal 360 degrees. Which means triangle is the half of a quadilatoral. Hope this answer helped you.