Question 1012002
y, how tall the elephant.


The linear corresponding parts between similar triangles are in proportion.
{{{10/20=y/8}}}



{{{drawing(600,300,-10,110,-10,50,
line(0,0,100,0),
triangle(0,0,0,50,100,0),
triangle(0,0,0,20,40,0),
locate(-7,50,tent),
locate(-8,20,elephant),
locate(100,-2,20),
locate(40,-2,8)
)}}}