Question 158705
(180-45)/2=135/2=67.5 is the angle to the peak.
tan67.5=2.414
2.414(21/2)=25.34 is the height of the A-frame
10.5^2+25.34^2=c^2
110.25+642.12=c^2
752.366=c^2
c=sqrt752.366
c=27.43 ft. is the distance from the ground to the peak.