The perimeter of a quadrilateral is 48CM. It is known that the first side is a & nbsp; cm, the second side is 3cm longer than twice the first side, and the third side is equal to the sum of the first and second sides. (1) write the formula for the length of the fourth side; (2) when a = 3cm or a = 7cm, can you still get a quadrilateral? What shape is the figure at this time?

(1) ∵ the first side length is ACM, according to the meaning of the title: the second side length is (2a + 3) cm, the third side length is (a + 2A + 3) cm, and the perimeter of the quadrilateral is 48CM, ∵ the fourth side length is: 48-a - (2a + 3) - (3a + 3), = 48-a-2a-3-3a-3, = 42-6a (CM); (2) when a = 3, the edges of the four sides

The volume of a cylindrical pool is 43.96 cubic meters, the bottom diameter is 4 meters, and the depth is ()

7/2

The lengths of three sides of a triangle are 3x cm, 4x cm, 5x cm, and the circumference is 48 cm

Perimeter calculation formula: 3x + 4x + 5x = 48
12x=48
x=4
So the three sides are 12cm, 16cm and 20cm respectively

The volume of a cylindrical pool is 157 cubic meters, the bottom diameter is 10 meters, and how deep is the pool?

3.14*(10/2)^2*h=157
h=2

If the ratio of the three sides of a triangle with a circumference of 18 cm is 2:3:4, the shortest side is 18 cm

18/(2+3+4)=2CM
2*2=4cm
A: the shortest side length is 4cm

A pool with a square bottom has a volume of 2.592 cubic meters and a depth of 0.8 meters?

The bottom area is 2.592 △ 0.8 = 3.24M
Because 3.24 = 1.8 × 1.8
So the bottom side length is 1.8 meters
It's 0.8 meters deep

(1) The length ratio of three sides of a triangle is 3:4:5, and the shortest side is 10 cm shorter than the longest side. What is the perimeter of the triangle?
(2) To build a section of highway, if 21 meters are built every day, it can be completed in 13 days. In order to speed up the construction after four days, how many days will it take for workers to build 6 meters more every day?
To solve the equation with

(1) The length ratio of three sides of a triangle is 3:4:5, and the shortest side is 10 cm shorter than the longest side. What's the circumference of the triangle? 10 △ 3 / (3 + 4 + 5) = 10 △ 3 / 12 = 40 cm (2) to build a section of highway, if 21 meters are built every day, it can be completed in 13 days

A cylindrical reservoir, the bottom circumference is 31.4 meters, to reduce the water surface by 60 cm, how many cubic meters of drainage

The perimeter is 31.4 meters
So radius = 31.4 / (2 * 3.14) = 5
So the bottom area = π R ^ 2 = 3.14 * 5 ^ 2 = 78.5 cubic meters
To reduce the water surface by 60 cm, drainage = bottom area * 60 / 100 = 78.5 * 0.6 = 47.1 m3 is required

The length ratio of the three sides of a triangle is 3; 4; 5. If the shortest side is 4 cm shorter than the longest side, what is the circumference of the triangle?

Let the three sides be 3x, 4x and 5x respectively
So 5x-3x = 4
We get x = 2
The length of three sides is 6,8,10
The perimeter is 24cm

A cylindrical tank, the bottom circumference is 31.4 meters, to reduce the water surface by 60 cm, you need to drain () cubic meters

A cylindrical tank, the bottom circumference is 31.4 meters, to reduce the water surface by 60 cm, need to drain (47.1) cubic meters
Bottom radius = 31.4 △ 3.14 △ 2 = 5m
Drainage = 5 * 5 * 3.14 * 0.6 = 47.1m3