Question 831387
The ladder,the floor & the wall form a right triangle.										
The base is one leg					The height is the other leg					
The ladder acts as the hypotenuse										
Pythagoras theorem										
										
(Hyp)^2=		(leg1)^2+			Leg2^2					
Hypotenuse =			15	ft						
leg1=			12	ft						
Leg2=			?							
										
leg2^2=hyp^2-leg1^2										
Leg2^2=		15	^2	-	12	^2				
Leg2^2= 		225	-	144						
Leg2^2= 		81								
Leg2=		{{{sqrt(	81	)}}}						
Leg2=		9	ft							
										
The ladder touches the wall at a height of									9	ft
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