Fill in the number of the correct answer in brackets &The movement of elevator ③ Take photos &(4) projection slide ⑤ Paper cut Butterfly A. Translation B, rotation C, symmetry D, magnification

Fill in the number of the correct answer in brackets &The movement of elevator ③ Take photos &(4) projection slide ⑤ Paper cut Butterfly A. Translation B, rotation C, symmetry D, magnification

① The minute hand and the hour hand of the clock face rotate around a point, so they rotate. ② the elevator moves up and down, so they translate. ③ taking photos is to reduce the figures in the photos according to a certain proportion. ④ the projection slide is to enlarge the pictures in the slides according to a certain proportion. ⑤ the paper-cut butterfly is to use the method of symmetry; A；D；D；C．

Fill in the blanks (choose the most appropriate group of words for each question and put the serial number in the brackets at the end of each question)
1、 For people in trouble, soothing their hearts is sometimes the most important. One sentence can make people confident, one sentence can make people warm, one sentence can make people brave
( )
1. Praise, encourage and greet 2. Praise, greet and encourage 3. Encourage, greet and praise
2、 () admit the mistakes and shortcomings modestly, () resolve to correct them, learn new knowledge and new skills, () deepen our understanding, and () master the rules step by step and win
1. As long as we can and thus 2. As long as we can and thus 3. As long as we can and thus

One 2
Two two

Choose words and fill in the blanks
Foreshadowing a failure and polishing a magic pen
Learning to write or draw at the beginning is called learning to write. Those with poor strokes are called (),
Superfluous and useless words are called redundancies, and clues for the latter part are called (),
Fascinating words are called (), especially wonderful words are called miaobi,
In ancient times, the contribution fee was (), and the writing before death was called posthumous writing

Learning to write or draw at the beginning is called learning to write. The bad strokes of words and sentences are called failure. The redundant and useless words are called superfluous ones. It is foreshadowing to lay clues for the later part. The fascinating words are called magic strokes. The especially wonderful words are called Wonderful ones. In ancient times, it was called retouching strokes. The words before death were called posthumous ones

How to write the area derivation process of trapezoid?

Let the length of the top bottom of the trapezoid be a, the length of the bottom be B, and the height be H. place two identical trapezoids on top of each other, then rotate one trapezoid 180 degrees clockwise around its lower right corner, and then translate one trapezoid height upward to form a flat quadrilateral with the length of the bottom a + B and the height H. the area formula of the flat quadrilateral is (a + b) * H, So the area of a trapezoid is 1 / 2 * (a + b) * H!

The formula of side area and letter formula of surface area of cylinder

2πrh
2πrh+2πr²

What is the formula for calculating the side area of a cylinder

After the expansion is a width to height
Having the circumference of two circles
rectangle

Formula of side area of cylinder

If the diameter of the bottom surface is known, it is: the diameter of the bottom surface * Wu * H = Wu DH. If the radius of the bottom surface is known, it is the radius of the bottom surface * 2 * Wu * H = 2 Wu RH, which is the circumference of the bottom surface * H = sh. why use the circumference of the bottom surface * H = sh? Because the side of the cylinder is expanded, it will get a rectangle or a square, and the rectangle

Side area and bottom area of cylinder, volume, surface area, side area and bottom area of cone, volume formula, don't use letters, such as radius and so on
I want words, not letters

Side area = perimeter * height = radius * 2 π volume = bottom area * height = square of 2 π * radius * high surface area = square of 4 π * radius + 2 π * high cone volume = square of 1 / 3 * 2 π * radius * high cylinder side area: S = 2 π RH, where R is bottom radius, h is high volume of cylinder: v = π h * (R ^ 2) surface product: S = 2 π RH + 2

The derivation process of the formula of the side area of a cone is given

Let the bottom diameter be D and the side line be L
The side of the cone is expanded into a sector, and the sector radius is the side line L
Sector area = arc length / perimeter * circle area
The arc length is the circumference of the bottom surface
So s side = π D / (2 π L) * π L & # 178; = π DL / 2 = π RL

The derivation formula of the area of a plane figure should be written in letters in the whole process
The area formula of square, parallelogram and circle is deduced from rectangle
And the area formula of trapezoid derived from circle

The area of a rectangle is equal to the length multiplied by the width. A square is a special rectangle, so the area of a square is equal to the side length multiplied by the side length
Parallelogram derivation is to cut the parallelogram along the height and form a rectangle by translation. The length of the rectangle is the bottom of the parallelogram, and the width of the rectangle is the height of the parallelogram. Because the area of the rectangle is equal to the length multiplied by the width, the area of the parallelogram is equal to the bottom multiplied by the height
The area derivation of a circle is to cut the circle along the radius to form an approximate rectangle. The length of the rectangle is half of the circumference of the circle, and the width of the rectangle is the radius of the circle. Because the area of the rectangle is equal to the length multiplied by the width, the area of the circle is equal to half of the circumference multiplied by the radius. That is, the area of the circle is equal to the ratio of the circumference multiplied by the square of the radius