The problem solving process is as follows:

(48- 18)÷2

=30÷2

= 15 (m)

18× 15=270 (m2)

The area of this flower bed is 270 square meters.

For extended data, there are several well-known simple shape formulas, such as triangle, rectangle and circle. Using these formulas, you can find the area of any polygon by dividing it into triangles. For shapes with curved boundaries, calculus is usually needed to calculate the area. In fact, the problem of determining the digital area of aircraft is the main driving force for the historical development of calculus.

For solid shapes such as spheres, cones or cylinders, the area of the boundary surface is called the surface area. The surface area formula of simple shapes was calculated by the ancient Greeks, but calculating the surface area of more complex shapes usually requires multivariable calculus.

Region plays an important role in modern mathematics. Area is not only important in geometry and calculus, but also related to the definition of decisive factors in linear algebra, which is the basic feature of surfaces in differential geometry.