Convert a circle into an approximate rectangle. If the circumference of the rectangle is 6 cm larger than that of the circle, how many square centimeters is the area of the circle Figure, draw circle 32 equal parts, expand into an approximate rectangle

Convert a circle into an approximate rectangle. If the circumference of the rectangle is 6 cm larger than that of the circle, how many square centimeters is the area of the circle Figure, draw circle 32 equal parts, expand into an approximate rectangle

6 / 2 = 3cm is the radius of the circle
3 * 3 * 3.14 = 28.26 square centimeter
It is to cut a circle into a sector and turn it over one by one. If a rectangle has more circumference, it is the two radii of the circle

The perimeter of a rectangular vegetable field is 184 meters, and its length is three times of its width?

Suppose the width is x meters, then the length is 3x meters. According to the meaning of the question, we can get the equation: 2 (x + 3x) = 184, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 8x = 184, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 23, then the length is 23 × 3 = 69 (meters). A: the length and width of a rectangle are 69 respectively

The perimeter of a rectangular vegetable field is 184 meters, and its length is three times of its width?

Suppose the width is x meters, then the length is 3x meters. According to the meaning of the question, we can get the equation: 2 (x + 3x) = 184, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 8x = 184, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 23, then the length is 23 × 3 = 69 (meters). A: the length and width of a rectangle are 69 respectively

The perimeter of a rectangular vegetable field is 184 meters, and its length is three times of its width?

Suppose the width is x meters, then the length is 3x meters. According to the meaning of the question, we can get the equation: 2 (x + 3x) = 184, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; 8x = 184, & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; & nbsp; X = 23, then the length is 23 × 3 = 69 (meters). A: the length and width of a rectangle are 69 respectively

Use a plane to cut a cube. Is the shape of the section trapezoidal? Draw it

It can be a triangle, along the diagonal
Trapezoid, from one corner to the other
Pentagon, draw lines on two adjacent sides

As shown in the figure, it is a cube. If a plane is used to cut the cube, the cross-section shape cannot be
A. Square B. triangle C. isosceles trapezoid D. circle

D impossible
A needless to say
B cut off a corner diagonally
C cut off two corners obliquely, and the section is not parallel to the edge

As shown in the figure, it is better to make a section of cube through three points

Suppose the red dot is the midpoint of each edge of the cube
Make adjacent cubes of the same size on the right back side of the cube
According to the scale, the bottom of the new cube is at the midpoint D of the back edge
Connect CD to get the intersection of the plane to be drawn and an edge of the front cube;
In the same way, we can get the intersection of the plane drawn and the other two edges B & # 39;, C & # 39;
Connecting AC & # 39; BA & # 39; CB & # 39; is the section to be drawn

Use a plane to cut a cuboid or cube, the cross section shape may be?

Use a plane to cut a cuboid or cube, the cross section shape may be?
square
rectangle
triangle

What is the cross section of a cube, a cuboid, a pentaprism, a hexaprism!

Cube: square, rectangle
Cuboid: rectangle
Pentagonal: regular pentagon, unequal polygon
Hexagonal: regular hexagon, unequal polygon

If you cut a cube with a plane, can the shape of the section be a rectangle? If you cut a cube with a plane, can the shape of the section be a square

Yes, x2
The first one can cross the diagonal of two cubes
Second, if the bottom of the cuboid is square, it can be cut parallel to the bottom