Question 187354
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Let's see the ladder leaning against the wall:
{{{drawing(400,400,-1,8,-1,11,line(0,0,0,10),line(0,10,.2,10),line(.2,10,.2,0),line(.2,0,0,0),green(line(.2,10,6,0)),green(locate(3,5,Ladder=L=30ft)),green(locate(1.6,.5,Distance=8ft)),red(locate(5.1,.6,sigma)),line(6,0,0,0),green(locate(-.2,5,Wall)))}}}
By Trigonometry Function:
{{{cos(sigma)=adj/hyp=Distance/L=8/30=0.2666667}}}
{{{sigma=cos^(-1)(0.2666667)}}}
{{{red(sigma=74.53^o)}}}
Thank you,
Jojo</font>