How do i insert the area of each shape in the centre of it?

This is my code below :

Answer 1

[Image Analyst]

Use sprintf() to create a string with the area in it. Then use text() to place it in the axes

caption = sprintf('Area = %.1f', area);
text(x, y, caption);

Of course you need to figure out what x and y are to position the string in the best looking spot.

[Yashlin Naidoo]

Hi,i just wanted to know how do i change the colour of the text to white?

[Image Analyst]

text(x, y, caption, 'Color', 'w');

[Yashlin Naidoo]

Hi there,i wanted to know how do i just add the area value in the text instead of area=value

[Image Analyst]

Just remove the "Area = " when you call sprintf():

caption = sprintf('%.1f', area);

[Yashlin Naidoo]

Hi there,i wanted to know how do i save an axis as a image automatically?

[Image Analyst]

See the FAQ: http://matlab.wikia.com/wiki/FAQ#How_do_I_save_my_figure.2C_axes.2C_or_image.3F_I.27m_having_trouble_with_the_built_in_MATLAB_functions.

[Yashlin Naidoo]

How to draw every type of triangle?

I was only able to generate a equilateral triangle with my code below;

%Triangle=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=

sides = 3;
 t = (1/(2*sides):1/(sides):1)*2*pi-pi/3;
 b = User_input(3);
 x = b*sin(t)+5/8*xmax;
 y = b*cos(t)+3/4*ymax;
 fill(x,y,'black');

[Image Analyst]

Not sure what you mean. To get every triangle, or just any triangle in general, you have to make the x and y have the coordinates of the three vertices. But I'm sure you know that already , so I'm not really sure what the question is.