roof hite=4 ft & slope=1:3...impli horzontal leng=3*4=12 ft
Slope=diagonal av rit triangel...leng=12 & hite=4, diagonal=sqrt(4^2 + 12^2)
=sqrt(16+144)=sqrt(160)=12.64911064 ft, or bout 12.65 ft
But maebee yu hav hip roof (go up tu peek, then bak down in bak)
so 2 diagonals=25.3 ft