The width of the rectangle is 25cm. How much will the area increase if its length is increased from 30cm to 35cm?

| March 1, 2021 | education

The area of ​​a rectangle is equal to the product of its length (a) and width (b):

S = a * b.

By condition, the width of the rectangle is 25 cm.

Let’s calculate the area of ​​a rectangle if its width is 25 cm and its length is 30 cm:
S₁ = 30 * 25 = 750 (cm²).

Let’s calculate the area of ​​a rectangle if its width is 25 cm and its length is 35 cm:
S₂ = 35 * 25 = 875 (cm²).

To calculate how much one number is greater than another, you need to subtract the second from the first number. If the difference is greater than 0, then the first number is greater than the second by the corresponding number of units. If the difference is less than 0, then the first number is less than the second by the corresponding number of units. If the difference is 0, then the first and second numbers are equal.
Let’s calculate by how many units the area of ​​a rectangle with a width of 25 cm and a length of 35 cm is greater than the area of ​​a rectangle with a width of 25 cm and a length of 30 cm:

S₂ – S₁ = 875 – 750 = 125 (cm²).

Answer: the area will increase by 125 cm².



One of the components of a person's success in our time is receiving modern high-quality education, mastering the knowledge, skills and abilities necessary for life in society. A person today needs to study almost all his life, mastering everything new and new, acquiring the necessary professional qualities.