Only three sides is one possible answer.
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A rectangle has four sides and four angles. A rectangle is a closed shape. All four angles of a rectangle are right angles. That is, they are 90 degrees. Opposite sides of a rectangle are the same length. Opposite sides of a rectangle are parallel. That is, if they were extended infinitely they wouldn't touch. ***Additionally, the diagonals of a rectangle are congruent (unlike other parallelograms), and they also bisect each other. While all parallelograms share the bisecting diagonals characteristic, only rectangles (and by extension squares) have congruent diagonals.***
Rectangle area = (rectangle width) x (rectangle height)
A = lw Area of a rectangle = length times width
The length of the rectangle is 18cm. The width of the rectangle is 9cm.
Rectangle