# How to plot a triangle with the user's measurments?

조회 수: 64(최근 30일)
Samy Ben Thabet 10 Oct 2018
답변: gonzalo Mier 10 Oct 2018
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

#### 댓글 수: 1

jonas 10 Oct 2018
EDIT 3:
The problem is that you cannot build a triangle of off any three sides. There are some constraints, and it seems I am too tired to formulate them right now. At the very least the sum of two sides must be greater than the third, as can be understsood from the "very thin" triangle. In fact, that is probably the only one, but you can make at least four mirrored triangles out of any three sides even if that condition is satisfied :)

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### 채택된 답변

gonzalo Mier 10 Oct 2018
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.

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