The lengths of two adjacent sides of a parallelogram are 5cm and 8cm respectively. What is the perimeter of the parallelogram In addition to the above question -- It is known that a group of adjacent sides of a parallelogram are 5cm and 4cm respectively, and the height is 3cm. Then the perimeter of the parallelogram --?

1. The perimeter of this parallelogram = (5 + 8) × 2 = 26 cm
2. Perimeter = (5 + 4) × 2 = 18cm

If the two sides of the parallelogram are 6cm and 8cm respectively, and the shorter one becomes 7.5cm, then the perimeter of the parallelogram is——

Originally 28, now 31

Use two parallelograms with 10cm bottom, 5.5cm height and 6cm hypotenuse, two rectangles with 10cm length and 2cm width, two geometric figures with 6cm length and 2cm width

The upper and lower bottom surfaces are parallelograms with the bottom 10cm high, 5.5cm high and the hypotenuse 6cm
The bottom of 10cm corresponds to the 10cm of the rectangle with the length of 10cm and the width of 2cm. The bottom of 6cm corresponds to the 6cm of the rectangle with the width of 6cm and the width of 2cm. The four rectangles are connected at the end to form a prism
Prism: two faces are parallel to each other, the other faces are quadrilateral, and the common edge of each adjacent quadrilateral is parallel to each other. The geometry surrounded by these faces is called prism
It is a four prism; the top and bottom surfaces are parallelograms, surrounded by rectangles;
Oblique tetrahedron

There are five boxes of the same size, 10cm in length, 5cm in width and 5cm in height
Where are the boxes?

This problem is very simple. I draw a model diagram to solve it. First, I put two small boxes below. The length of the small box is parallel to the width of the big box. The remaining length of the big box is 3cm, which is just 2.5cm of the width of the small box. That is to say, I put the small box in a tree. The length of the small box is parallel to the width of the big box. The width of the small box 5cm is just less than

Take three of the five sticks from the bottom randomly and put them into a triangle. What are the different ways to put them? 3cm 4cm 5cm 6cm 9cm

Definition of triangle: the sum of any two sides of a triangle must be greater than the third side, so it can be proved that the difference of any two sides of a triangle must be less than the third side,
3 4 5,4 5 6,3 4 6,3 5 6,4 6 9,5 6 9

The lengths of three sides of a triangle are 6cm, 9cm and 7.5cm respectively, and the lengths of three sides of another triangle are 8cm, 10cm and 12cm respectively. Are these two triangles similar? Why

Similar
6：8=7.5：10=9：12=3：4
The ratio of the corresponding edge is equal

The length of three sides of one triangle is 6cm, 9cm and 7.5cm respectively, and that of the other triangle is 8cm, 12cm and 10cm respectively
The lengths of three sides of one triangle are 6cm, 9cm and 7.5cm respectively, and the lengths of three sides of the other triangle are 8cm, 12cm and 10cm respectively. Are the two triangles similar? Why?

The two triangles are similar
The length of six sides of two triangles can form the following proportional relationship:
6cm: 8cm = 9cm: 12cm = 7.5cm: 10cm
If the three corresponding sides of two triangles are proportional, the two triangles are similar
We can know that these two triangles are similar triangles

It is known that three sides of ABC are 6cm, 7.5cm and 9cm, and one side of ABC is 4. When are two triangles similar

There are three cases when 6 corresponds to 4
Then 7.5 corresponds to 5
9 corresponds to 6
When 7.5 corresponds to 4
Then 6 corresponds to 3.2
9 corresponds to 4.8
When 9 corresponds to 4
Six corresponds to eight thirds
7.5 corresponds to 10 / 3

The height of a parallelogram is 45 decimeters, and its bottom is 12 decimeters high. The area of this parallelogram is______ ．

(45 × 12) × 45, = 25 × 45, = 825 (square decimeter); answer: the area of this parallelogram is 825 square decimeter

A parallelogram, its height is 1.5 cm, the bottom is 1.2 times the height, the area of this parallelogram is______ Square centimeter

1.5 × 1.2 × 1.5 = 1.8 × 1.5 = 2.7 (square centimeter) answer: the area of this parallelogram is 2.7 square centimeter, so the answer is: 2.7