Question 558802
The ladder ,ground and the wall form a right triangle						
ground distance = leg2						
height at which ladder touches						
Hypotenuse = ladder length						
Pythagoras theorem states that						
						
Hypotenuse ^2= leg1^2+leg2^2						
						
Hypotenuse =	25	ft				
leg1 = 	20	ft				
						
leg2^2= hypotenuse ^2 - leg1^2						
						
Leg2^2=	25	^2	-	20	^2	
Leg2^2=	625	-	400			
Leg2^2=	225					
take the square root						
leg2=	15	ft				
						
Distance of ladder on ground	=	15	ft
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