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Answer:
(x^2 + 2x) cm^2
Explanation:
Area of trapezium = 1/2 (a+b)h
= 1/2 [(x+3)+(x+1)] (x)
=1/2 (2x+4)(x)
= 1/2 (2x^2 + 4x)
= x^2 + 2x
area of trapezium in terms of x=1/2*x(x+3+x+1)