How to calculate area of Rectangle, Triangle or Circle in Excel

Geometry is known to make mathematics and calculations easy. The area of basic shapes like rectangle, triangle, and circle can be calculated using certain formulae. If you need to calculate the area of basic shapes for a range of entries, Excel would be very useful. In this article, we have explained the procedure to calculate areas of a rectangle, circle, and triangle in Excel.

Calculate the area of a Rectangle in Excel

The basic formula for calculating the area of a rectangle in Excel is: length * height. Thus, the syntax of the formula for finding the area of a rectangle in Excel would become:

=<cell with length>*<cell with height>

Eg. Let us assume we have a list of lengths of rectangles spread across column A from cell A3 to A11 and the heights of the rectangles spread across column B from B3 to B11. We need the area of the rectangle in column C from C3 to C11.

Now, the formula for the rectangle for C3 would become:

=A3*B3

You could use the Fill function to pull the formula down to C11. Simply click outside the cell C3 and back on it. Then use the fill button at the right bottom corner to pull the selection down to C11.

Calculate the area of a Triangle in Excel

The formula for calculating the area of a triangle is (length * height)/2. Thus, the syntax of the formula for finding the area of a triangle in Excel would become:

=(<cell with length>*<cell with height>)/2

Eg. Let us consider the length and height in columns A and B as in the previous example. We need the areas of the triangles in column D from D3 to D11.

Now, the formula for the triangles for C3 would become:

=(A3*B3)/2

You can use the Fill function as explained earlier to pull the formula down to D11.

Calculate the area of a Circle in Excel

The area of a circle is 3.14*(radius*radius). To create the formula in Excel, I could suggest the exponential function however, since the goal is just to find the square, we can twist the formula a little. The syntax to find the area of a circle in Excel is as follows:

=3.14*<cell with radius>*<cell with radius>

Eg, if we have the list of radii in column F from F3 to F11 and we need the areas of the circles in column G from G3 to G11, then the formula for cell G3 would become:

=3.14*F3*F3

You could use the Fill function to pull the formula down to cell G11.

Does this work?