Question 564720
The ladder ,ground and the wall form a right triangle							
ground distance = leg1							
height at which ladder touches	=leg2						
Hypotenuse = ladder length							
Pythagoras theorem states that							
							
Hypotenuse ^2= leg1^2+leg2^2							
							
Hypotenuse =	19.5	ft					
leg1 = 	7.5	ft					
							
leg2^2= hypotenuse ^2 - leg1^2							
							
Leg2^2=	19.5	^2	-	7.5	^2		
Leg2^2=	380.25	-	56.25				
Leg2^2=	324						
take the square root							
leg2=	18	ft					
							
Height at which ladder touches the wall=	18	ft	
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