Question 203747
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Let us see the tree and the shadow form a Right Triangle:
{{{drawing(300,300,-2,8,-1,9,line(0,0,0,8),line(0,8,.2,8),line(.2,8,.2,0),line(.2,0,0,0),line(-2,0,6,0),green(line(.2,8,6,0)),green(locate(-1,5,tree)),green(locate(-.4,4.5,b=48m)),locate(1.5,5,shadow=hyp),green(locate(3.1,3.5,c=52m)),red(locate(3,-.2,a))))}}}


*The only unknwon side of the triangle is {{{red(a)}}}, that is the distance from the end of the shadow to the tree.


By Pyth. Theorem, {{{a^2+b^2=c^2}}}
{{{a^2=c^2-b^2=52^2-48^2=2704-2304=400}}}
{{{a=sqrt(400)}}}
{{{red(a=20m)}}}, Answer


Thank you,
Jojo</font>