One side of the rectangle is 40cm. The perimeter of the rectangle is 210cm. Find the area of the rectangle.

Let’s find the value of the unknown side of the rectangle given to us, for this we need to divide the value of the perimeter of the given rectangle by two, and subtract the value of the known side from the result obtained:

210: 2 – 40 = 65 cm – this is the value of the length of the rectangle given to us;

Let’s find the value of the area of ​​the rectangle given to us, for this we need to multiply the value of the width of the rectangle given to us by the value of the length of the rectangle given to us:

40 * 65 = 2600 cm2 – this is the value of the area of ​​the rectangle given to us.

Answer: 2600 cm2 is the value of the area of ​​this rectangle.