Question 524242
The ladder,the floor & the wall form a right triangle.			
			
The ladder acts as the hypotenuse			
Pythagoras theorem			
			
(Hyp)^2= 		(leg1)^2+	
Hypotenuse =			20
leg1=			15
Leg2=			?
			
leg2^2=hyp^2-leg1^2			
Leg2^2= 		20	^2
Leg2^2= 		400	-
Leg2^2= 		175	
Leg2= 		{{{sqrt(175)}}}	
Leg2=		13.23	
			
The ladder touches the wall at a height of 13.23 ft
			
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