How do I calculate the excavation volume of a septic tank? Now the length of the bottom layer is 7.7m, the width is 12M, and the slope is 1:1. How do I calculate? What is the calculation formula

How do I calculate the excavation volume of a septic tank? Now the length of the bottom layer is 7.7m, the width is 12M, and the slope is 1:1. How do I calculate? What is the calculation formula

a=7.7 b=12 m=1 h=9.3;
S=(a+2h+a)×h/2
V=Sb
V is the volume of excavation

The formula of distance on the graph and actual distance, scale = distance on the graph / actual distance I know

Well, as you know: distance on the graph △ actual distance = scale
Also: actual distance × scale = distance on the map
: the distance on the map is equal to the actual distance
If you really don't understand, you should ask the teacher. Don't be a scholar on the Internet. If you write wrong, it will mislead you. Good luck

For a trapezoidal board, the upper bottom is 2.5m, and the lower bottom is 2m less than 2 times of the upper bottom. What is the area of this trapezoidal board?

（2.5+2.5*2-2）/2=2.75

The area of a trapezoidal field is 90 square meters, the upper bottom is 7 meters, and the lower bottom is 11 meters. How high is it?

Let the height of this trapezoidal field be x meters, (7 + 11) x △ 2 = 90 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 18x = 180, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 10, a: the height of this trapezoidal field is 10 meters

The area of a trapezoidal field is 90 square meters, the upper bottom is 7 meters, and the lower bottom is 11 meters

Now let the height be h, and then ((7 + 11) H) △ 2 = 90
H = 10

The area of the trapezoidal field is 270 square meters, the upper bottom is 17 meters, and the lower bottom is 19 meters. How high is it

Set the height to x meters
Then (17 + 19) x / 2 = 270
18x=270
x=15
A: the height is 15 meters

The area of a trapezoid is 50 square meters, the upper bottom is 11 meters, and the lower bottom is 14 meters. How high is the trapezoid?

50% 2 = 100
11＋14=25
100➗25=4
The height is four meters

The area of a trapezoidal field is 90 square meters, the upper bottom is 7 meters, and the lower bottom is 11 meters. How high is it?

Let the height of this trapezoidal field be x meters, (7 + 11) x △ 2 = 90 & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 18x = 180, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 10, a: the height of this trapezoidal field is 10 meters

Judge right or wrong. The bottom area of the cone is 3 square meters, and the volume must be 6 cubic meters

No, because there are side areas

The bottom area and height of a cylinder and a cone are equal. It is known that the volume of a cone is 12 cubic meters less than that of a cylinder. What is the volume of a cylinder?

450877085,
Analysis: the area and height of the bottom are equal, which means that the cylinder and the cone have the same bottom and height. For the cylinder and the cone with the same bottom and height, the volume of the cylinder is three times that of the cone
Cone volume: 12 ÷ (3-1) = 6 (M3)
Cylinder volume: 6 × 3 = 18 (M3)