Multiply length times width.
You don't. You can find the area of geometric figures, not of numbers.
Not easily. You need to find the area or perimeter of the components and sum them.
Different figures have different rules to determine the area of it.
A binomial is an algebraic expression. It does not have an area.
The surface area of the 3-D figure will be the total of the areas of the 2-D figures.
by subtracting
To find the surface area of similar figures, you first need to determine the scale factor between the two figures. If the scale factor is ( k ), then the ratio of their surface areas will be ( k^2 ). Multiply the surface area of one figure by ( k^2 ) to find the surface area of the similar figure. This principle applies to any pair of similar shapes, regardless of their dimensions.
Different figures have different formulae; here you will find formulae for the areas of some figures: http://en.wikipedia.org/wiki/Area#Formulae
Once you know the coordinates, you can use the distance formula to find the lengths of the sides, then using that, you can find the area.
You get the area by using formulas. There is usually a specific formula to find the area of each shape. Some irregular shaps may not have a formula.
Try to decompose the figure into simple figures, for which formulae are known - such as triangles, rectangles, circular segments, etc.
To find the area, first divide the shape into regular, simple shapes. Then use formulas to find the area of the smaller, regular shapes. Lastly, add up all the smaller areas to find the area of the original shape.