Build a rectangle that is 7 cm long and 4 cm less wide. Find the perimeter and area of the rectangle.

We need to build a rectangle, the length of which is 7 cm, and the width is 4 cm less than the length. Knowing this, we can find the width of the desired rectangle:

7 – 4 = 3 cm

Thus, we get a rectangle of 7 cm by 3 cm.

Now let’s find its perimeter. To do this, we will use the formula:

P = 2 * (a + b)

where a is the length (in our case it is 7 cm)

b – width (3 cm)

Then we get: P = 2 * (a + b) = 2 * (7 + 3) = 2 * 10 = 20 cm

Next, we find the area. There is a formula for this:

S = a * b

we substitute our values into this formula and get:

S = a * b = 7 * 3 = 21 cm. Sq.