What is the diameter equivalent to a diameter of 50?
According to the conversion formula between breast diameter and diameter, the diameter of the soil ball = 8 - 10 times the breast diameter. Assuming the relationship of 10 times here, when the breast diameter is 50, the diameter is 50×10 = 500. However, according to the conventional understanding, breast diameter was a representation of diameter. A breast diameter of 50 was equivalent to a diameter of 50. Since the reference materials did not specify the conversion relationship under which circumstances, there were these two possible situations. "Life Like a White Birch" is equally exciting. Everyone is welcome to click and read it!
Is the diameter or circumference of the tree diameter at breast height?
The diameter at breast height referred to the diameter, which was the diameter of the trunk of the tree 1.3 meters above the ground. "Life Like a White Birch" is equally exciting. Everyone is welcome to click and read it!
diameter of the earth
The average diameter of the Earth was 12,742.02 kilometers, the diameter of the Earth's equator was 12756 kilometers, and the diameter between the North and South Poles was 12631 kilometers.
What is the diameter of the earth?
The diameter of the Earth is 12742 kilometers.
The diameter of the earth is 12,800 kilometers
The average diameter of the Earth was about 12,742 kilometers, the diameter of the Earth's equator was about 12,756 kilometers, and the diameter between the North and South Poles was about 12,631 kilometers. Therefore, saying that the diameter of the Earth was about 12,800 kilometers was an approximate statement.
How to measure the diameter of the tree
The diameter at breast height of the clumped trees was measured at a place 1 meter above the ground (referring to the seedlings with higher branches. If the branches were low, the measurement height would also be lower). Because the clumped trees had many trunks and branches, all the branches had to be taken into account when measuring the diameter at breast height. Each branch had to be measured and the data of each branch had to be marked in detail. However, in the measurement of the size of the clumped trees, the diameter at breast height was generally not the main reference. This kind of seedlings mainly looked at the height and crown width, and the diameter at breast height could be used as a supplementary material for measurement. "Life Like a White Birch" is equally exciting. Everyone is welcome to click and read it!
How to calculate the diameter of the tree
The calculation method of the diameter at breast height of a clumping tree is as follows: (If the branch point is low, the measurement height will be reduced accordingly.) To measure the diameter at breast height of each branch, the data of each branch must be marked in detail. The diameter at breast height of the clustered tree is calculated according to 0.75 times the sum of the diameter at breast height of each trunk. There is also a calculation method of directly adding the diameter at breast height of each trunk (for example, the diameter at breast height of several branches can be added to calculate the basic price of the clustered hackberry tree, but this is not the standard calculation method of diameter at breast height and is only for reference). However, clumps of trees were usually mainly based on height and crown width, and the diameter at breast height was only used as supplementary material. "Life Like a White Birch" is equally exciting. Everyone is welcome to click and read it!
How is the diameter of the earth measured?
Here are some ways to measure the diameter of the Earth: 1. ** Radian measurement method **: In 225 B.C., the ancient Greek astronomer Eradossus first used sunlight to measure the radius of the Earth and then the diameter. He found that during the summer solstice, the sun shone directly at the bottom of the well in Sai City, and there was no shadow on the vertical wooden pole. However, in Alexandria City, which was 500 miles away from ancient Greece, the vertical wooden pole deviated from the vertical direction by 7.2°. He believed that the central angle of the arc between the two places was 7.2°. According to the distance between the two places and the relationship between the arc length and the central angle, the radius of the earth could be calculated, and then the diameter could be obtained. It was generally believed that one mile in ancient Greece was about 158.5 meters, so the radius of the Earth was about 6310 kilometers and the diameter was about 12620 kilometers. 2. ** Triangulation Method **: According to the method proposed by Wallace, two wooden poles with the upper end point distance of A B = 2a were erected on the straight canal. The distance from them to the horizontal plane was h. The third wooden pole was erected in the middle of the two wooden poles, so that the upper end point C was on the connecting line A B. Since the surface of the earth was curved, the height h1 from point C to the horizontal plane was slightly smaller than h2. In a circle with the radius of the Earth as R, UA = OB = R+h. Since AOAAB is an isosceles-triangle, so BG = AB = a. In Rt-Boc, the radius of the Earth could be calculated from the length of the A and B and the height of the wooden pole, thus obtaining the diameter. 3. ** Using sun angle measurement method **: - Prepare to measure before and after the business trip (the longer the distance, the better, such as 1000 kilometers). Prepare a ruler to measure the sun's angle in advance (a flat surface below, with a stick erected on it, record the shadow of the stick on the flat surface under the sun's illumination). Before he left, he would draw the sun projection A at a certain point in the afternoon. On the day of his arrival, he would draw the second sun projection B at the same time. The distance between the two places was Y kilometers, and the angle X° between the A and B lines was measured. According to the formula 360Y/X*3.14, the diameter of the Earth could be calculated. - Eratosthenia's method was to observe the shadow of the obelisk in Alexandria Port during the summer solstice. Through the height of the obelisk and the length of the shadow, the angle between the sun and the obelisk was calculated. According to Thales 'parallel angle theorem, this angle was the angle between the two radiuses of the two cities connected to the earth's core. He calculated that the angle was about 7°12 '(about 2% of the circumference of 360°), and then calculated the distance between the two cities (he calculated the distance between the two cities by calculating the number of steps and stride of the camel team and found that the distance between the two cities was 5000 Greek miles. One Greek mile was equal to 157.5 meters), multiplied by 50 times to get the circumference of the Earth, and then calculated the diameter.
What is the diameter and circumference of the earth?
The average diameter of the Earth was 12,742.02 kilometers, the diameter of the equator was 12756 kilometers, the diameter between the North and South Poles was 12631 kilometers, and the circumference of the equator was about 40076 kilometers.
A variety of roses with a diameter of 20 cm
The roses with a flower diameter of 20 cm included Grand Siecle, Elena, Peony Rose, Red Fan, Pink Peace, Double Happiness, and so on. " Rose Fragrance Shadow: The Story of Sweetheart's Growth " was equally exciting. Everyone was welcome to click and read it!
What is the diameter of the big round table?
The diameter of the large round table was generally available in a variety of size, including 150cm, 160cm, 170cm, 180cm, 200cm, 220cm, 240cm, 260cm, 300cm, etc.