A rectangular piece of land is 24 meters long and 512 meters wide. How many square meters is the area of this piece of land?

A rectangular piece of land is 24 meters long and 512 meters wide. How many square meters is the area of this piece of land?

24 × (24 × 512) = 24 × 10, = 240 square meters; a: the area of this land is 240 square meters

A rectangular piece of land 24 meters long and 12 meters wide is covered with lawns all around. The width is the same. The flower beds account for five ninths of the rectangular area

What does a flower bed mean? A rectangular land 24 meters long and 12 meters wide, or a lawn around it?
I understand it as grass
Let the width of the grass be X
[（24+2X）*（12+2X）-24*12]/（24*12）=5/9
X * x + 18x-40 = 0
(X+20)(X-2)=0
Because x > 0, x = 2
The width of the grass is 2 meters

If the length of a rectangle is reduced by 3 meters, or if the width is reduced by 2 meters, the area will be reduced by 24 square meters?
x: Wide
Y: Long
(y-2)*(x-3)+24=xy

96 square meters, what do you think? 3 × x = 24, x = 8
2×Y=24 Y=12
Then 12 × 8 = 96
It's very simple

The side area of a cylinder is 18.84 square decimeters, and its height is 5 decimeters. How many square decimeters is its bottom area

The side area of the cylinder is the circumference of the bottom surface × the height, so the circumference of the bottom surface is 18.84 △ 5
The radius of the cylinder = (18.84 △ 5) △ 3.14 △ 2 = 18.84 △ 3.14 △ 5 △ 2 = 0.6 decimeter
Base area = 3.14 × 0.6 ﹥ 178; = 1.1304 decimeters ﹥ 178;
If you don't understand, you can ask! If you are satisfied, please accept it in time_ ∩)O

The side area of a cylinder is 18.84 square decimeters, and the height is 3 decimeters. What is the radius of the bottom of the cylinder?

18.84÷3=6.28
2 = 1 (decimeter)

The side area of a cylinder is 18.84 square decimeters, the bottom radius is 1 decimeter, and the height is () decimeter

The side area of a cylinder is 18.84 square decimeters, the bottom radius is 1 decimeter, and the height is (3) decimeters
Height = 18.84 ÷ (1 × 2 × 3.14) = 3 decimeters

The side area of a cylinder is 18.84 square meters, the height is 3 meters, and its bottom area is () cubic meters

Perimeter of bottom surface = 18.84 △ 3 = 6.28m
Radius = 6.28 △ 3.14 △ 2 = 1m
Bottom area = 3.14 × 1 & # 178; = 3.14 square meters
If you understand and solve your problem,

The side view of a cylinder is a square, the height of the cylinder is 18.84 decimeters, the side area of the cylinder is () square decimeters, and the bottom area is ()

354.945≈354.95 28.26

The side area of a cylinder is 18.84 square decimeters, the diameter of its bottom is 3 decimeters, and what is the height of the cylinder?

According to the formula of side area s = CH and C = π D
18.84 ÷ (3.14 × 3) = 2 decimeters

The perimeter of a rectangle is 31.4. The perimeter of a circle is equal to that of the rectangle. How many square meters is the area of the circle? Hurry up and kiss me in the exam!

2 π r = 31.4, so r = 10. S = π R * 2 = 87.5