Question 388171
{{{drawing(300,300,-2,8,-2,8,grid(1),
circle(5,4,0.2),circle(3,-1,0.2),circle(7,-1,0.2),
line(5,4,3,-1),line(3,-1,7,-1),line(7,-1,5,4),
graph(300,300,-2,8,-2,8,0))}}}
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Use the distance formula to find the length of the sides,
{{{D^2=(x[2]-x[1])^2+(y[2]-y[1])^2}}}
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{{{AB^2=(3-5)^2+(-1-4)^2}}}
{{{AC^2=(7-5)^2+(-1-4)^2}}}
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{{{BC^2=(7-3)^2+(-1-(-1))^2=4^2}}}
{{{highlight(BC=4)}}}