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In Triangle DAB, by applying Pythagoras theorem=41^2-40^2=81..so DA=√81=9cm..so area of trapezium=1/2*(20+40)*9=30*9=270cm^2

= (41)^2-(40)^2

=81 cm AD=9

Area= 1/2*(40+20)*9

=270 sq cm

Area= 1/2*(sum of parallel lines)*distance between them