Which of the following would best be solved using completing the square

Which of the following is the shape of a cross section of the figure shown below

If i had 1234 apples and 1 banana what is the total amount

The point of intersection of the diagonals of a rectangle is 4 cm further away from the smaller side then from the larger side of the rectangle. the perimeter of the rectangle is equal to 56 cm. find the lengths of the sides of the rectangle. 16 points answer quick