
I have to determine "a" so that the area of triangle is the largest.

There are 3 different rules for finding the area of a triangle:

triangle area

In the figure below, prove that the area S1 of the central triangle region

triangles and you are triangle to find the area of one of the triangles.

into two triangles, find the area of each triangle as above,

Determine if a point lies within area of a triangle

Triangle Area, Orthic Triangle, Semiperimeter, Circumradius.

As you have just observed, the area of triangle ABC does not change when we
![title(['Area of triangles in square pixels: ' num2str(sum(triarea))]) title(['Area of triangles in square pixels: ' num2str(sum(triarea))])](http://www.mathworks.com/matlabcentral/fx_files/5726/1/content/ColorArea_04.png)
title(['Area of triangles in square pixels: ' num2str(sum(triarea))])

of triangles, quadrilaterals, and circles; and the calculation of area

Calculating the Area of a Triangle

you cannot change the area it occupies, as the area of the triangle

"And the area of all four triangles?"

Another property is that the area of any triangle equals one-half the height

The area of the pentagon is the combined area of the 5 triangles shown in

equal to the area of triangle, then the lune can be squired as follows.

Area of triangle, circle, curvilinear

Drawing of a triangle. The total area for both of your wings is your answer

I can see three methods to find the area of the triangle.