Question

Длина обложки учебника 20 см что составляет одну 10-ю часть ее поверхности чему равна площадь поверхности обложки учебника ?

Answer 1

1)20×10=200(см) - площадь поверхности обложки учебника

Ответ: 200 см

Answer 2

Calculation of the Surface Area of the Textbook Cover

To calculate the surface area of the textbook cover, we need to know the length of the cover and the proportion of its surface area that is represented by one-tenth.

Given that the length of the textbook cover is 20 cm and one-tenth of its surface area is required, we can proceed with the calculation.

Let's denote the surface area of the textbook cover as A.

To find the surface area of the textbook cover, we can use the formula for the surface area of a rectangular prism, which is given by:

A = 2lw + 2lh + 2wh

where l represents the length, w represents the width, and h represents the height of the rectangular prism.

In this case, since we are only given the length of the cover, we can assume that the width and height are equal. Therefore, we can rewrite the formula as:

A = 2lw + 4lh

Since the length of the cover is 20 cm, we can substitute this value into the formula:

A = 2(20)w + 4(20)h

Now, we need to find the proportion of the surface area that is represented by one-tenth. Let's denote this proportion as P.

P = A/10

Substituting the value of A into the equation, we get:

P = (2(20)w + 4(20)h)/10

Simplifying the equation, we have:

P = 4w + 8h

Therefore, the proportion of the surface area of the textbook cover that is represented by one-tenth is given by 4w + 8h.

Please note that we do not have enough information to determine the exact value of the proportion or the surface area of the textbook cover without knowing the width and height of the cover.

If you have any additional information or if there is anything else I can assist you with, please let me know!