Please choose the correct ending to complete the given sentence: Education and Communications: [header] How to calculate the area of a rectangle [title] Understand the rectangle. [step] The rectangle is a quadrilateral, which means it has four sides. Its opposite sides are equal in length, so the sides along its length are equal, and the sides along its width are equal as well.

Ending1: [substeps] Therefore, if your x-axis is " six " and the x-axis is " eight, " that means it has four sides. The x-axis is the top left part of the square. Ending2: If one side of the rectangle is 10, for example, then the opposite side's length will also be 10. [substeps] Also, every square is a rectangle, but not all rectangles are squares. Ending3: The vertical lines in the horizontal line are equal, and the vertical lines are equal again. [substeps] This is the area of the rectangle for which the rectangle we will be using is also known as the radius. Ending4: The quadrilateral pole branches extend from the top of the two short sides, beyond the length of the rectangle, and into its midpoint. [substeps] Two larger quadrilateral poles extend up from the top of the rectangle, going all the way around its compass compass to the north pole.

Answer format: ending1/ending2/ending3/ending4