Parallelogram, perimeter is 96 cm, a bottom edge is 30 cm long, the height of this bottom edge is 15 cm, how many cm is the height of the other bottom edge?

Parallelogram, perimeter is 96 cm, a bottom edge is 30 cm long, the height of this bottom edge is 15 cm, how many cm is the height of the other bottom edge?

Set the height to X
Area of parallelogram: 30 * 15 = 450
Length of the other bottom side: (96-2 * 30) / 2 = 18
So 18 * x = 450, x = 25
The height is 25 cm

The perimeter of a quadrilateral is 48 cm, the first side is a cm, and the second side is 3 times longer than the first side
When a = 7 cm, can we still get quadrilateral? What shape is the figure?

1. First, we analyze the situation that the first side is 3cm: the first side is 3, the second side is 3 * 2 + 3 = 9, the third side is 3 + 9 = 12, and the fourth side is 48-3-9-12 = 24. Because the sum of the first three sides is equal to the fourth side, we can't form a quadrilateral. If we want the connection points of the four sides to coincide, the first three sides will be straightened and coincide with the fourth side

The perimeter of a quadrilateral is 46 cm. It is known that the first side is a cm, the second side is 5 cm less than three times of the first side, and the third side is a cm
The sum of Article 1 and Article 2
1. Find the length of the fourth edge (expressed by the formula containing a)
2. When a = 7, can we still get quadrilateral? Why? What shape is the figure at this time?

(1) If the first side length is a, the second side length is 3a-5, and the third side length is 4a-5, it can be seen from the above that the fourth side length is 56-8a
(2) It can be seen from the title
The lengths of the four sides are: 7, 16, 23 and 0. Obviously, these four sides can't form a quadrilateral, and according to the theorem of forming a triangle, the above conditions can't form a triangle, so they are a straight line. If you are satisfied, you can give points!