Question 677322
Make two segments with the same length, joined at one end (point R), one vertical and the other one horizontal. (They form 90 degree angle CRA).
Join the free ends (points A and C).
{{{drawing(300,300,-1,5,-1,5,
triangle(0,0,0,4,4,0),
locate(-0.2,-0.1,R),locate(4.1,-0.1,A),
locate(-0.2,4.5,C)
)}}}