9 sq cm
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The information given describes a square and not a trapezium. Area of the square = 3*3 = 9 square cm
The area of triangle is : 18.0
A square with a side length of 3 cm has an area of 9 cm2
It is: 3 times 3 = 9 square cm
The area of one face of a 3cm cube is the area of a 3cm square. That's 3 x 3 = 9cm2.