Question 316641
The ladder, the distance from the ladder base to the building, and the distance from the ground to the ladder on the building form a right triangle.
{{{drawing(300,300,-2,12,-2,12,line(0,0,0,10),locate(2.5,4.5,12),locate(2.7,1,70),locate(1.2,-0.5,ADJ),locate(-1.5,4,OPP),line(0,0.5,0.5,0.5),line(0.5,0.5,0.5,0),line(0,0,10,0),blue(line(4,0,0,8)))}}}
From trigonometry,
{{{sin(70)=OPP/12}}}
{{{OPP=12*sin(70)}}}
{{{OPP=12*0.9397}}}
{{{OPP=11.28}}}
It's a little over 11 1/4 feet from the ground to the ladder.