MATLAB: How to plot a triangle with the user’s measurments

plottriangle

Hey I am trying to plot a triangle with the user's measurements but I can't figure it out. Here is what I tried but it doesn't work.

elseif strcmp(h, 'triangle') a=input('The length of the first side is (m):'); b=input('The length of the second side is (m):'); c=input('The length of the third side is (m):'); plot([0 0],[b 0],[b a],[a c],'r','LineWidth',3) end

Best Answer

Just try:

ang = acos((a^2+b^2-c^2)/(2*a*b))
if(isreal(ang))
  plot([0,a,b*cos(ang),0],[0,0,b*sin(ang),0])
end

I'm just using the cosene theorem.

Related Solutions

MATLAB: Trying to find if three inputed numbers can make a right triangle

It is difficult for me to follow your code. I would do it this way:

sortsides = sort(sides);
istri = sum(sortsides(1:2)) >= sortsides(3);                            % Will The 3 Numbers Form A Triangle?
isrightri = sum(sortsides(1:2).^2) == sortsides(3).^2;                  % Is It A Right Triangle?
if isrightri
    fprintf('\n\tThe numbers {%d, %d, %d} form a right triangle.\n', sortsides)
elseif istri && ~isrightri
    fprintf('\n\tThe numbers {%d, %d, %d} do not form a right triangle.\n', sortsides)
elseif ~istri
    fprintf('\n\tThe numbers {%d, %d, %d} do not form any triangle.\n', sortsides)
end

The ‘sortsides’ assignment sorts the sides in ascending order. This is important for the efficiency of the code! If the sum of the lengths of the two shorter sides is greater that the length of the third side, then you can form a triangle (the istri assignment), otherwise it is impossible to form any triangle from them. Then determine if it is a right triangle, using the Pythagorean Theorem.

MATLAB: How to plot a shape away from the x and y axis

Just adjust the axes limits

h=input('What shape do you want?:','s'); 
a=input('The length of a side is (m):'); 
if strcmp(h, 'square') 
    plot([0 0 a a 0],[0 a a 0 0],'r','LineWidth',3) 
    xlim([-a 2*a]);
    ylim([-a 2*a]);
end

Best Answer

Related Solutions

MATLAB: Trying to find if three inputed numbers can make a right triangle

MATLAB: How to plot a shape away from the x and y axis

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