# Find the perimeter of the rectangle if you know the area of the triangle and the side.

September 15, 2021 | education

| **Find the perimeter of the rectangle if you know the area of the triangle and the side. The width is 2 dm and the area of the (right-angled) triangle S = 8 dm2**

A rectangle is a rectangle with equal opposite sides and right angles.

Its area (numerical characteristic of a two-dimensional geometric figure) is calculated by the formula:

S = a * b. Provided that this value is 8 dm², and the width = 2 dm, we express the length (to find the first factor, divide the product by the second:

a = S: b = 8: 2 = 4 dm.

The perimeter is the sum of all sides. For a rectangle, it is determined by the formula:

P = 2a + 2b = 2 * 4 + 2 * 2 = 8 + 4 = 12 dm.

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.