Changes
From Karnataka Open Educational Resources
380 bytes added
, 13:04, 11 July 2014
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OC= 3.25 mt
OC= 3.25 mt
radius of arch is 3.25 mt
radius of arch is 3.25 mt
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# 3 The sides of a right angled triangle are in an AP. Show that sides are in ther ratio 3:4:5
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'''Solution'''
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# The sides of a right angled triangle are in an AP. Show that sides are in ther ratio 3:4:5
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IN right angled triangle ABC
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If ∟B=90º and sides are in AP
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Let AB= a-d
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BC= a
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AC= a+d
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then <math>(a+d)^2=a^2+(a-d)^2</math>
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<math>a^2+d^2+2ad=a^2+a^2+d^2-2ad</math>
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<math>a^2=4ad</math>
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a=4d
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AB=a-d=4d-d=3d
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BC= a=4d
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AC= a+d+ 4d+d =5d
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ratio of sides is 3d:4d:5d
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if sides of the right angled triangle are in ratio 3:4:5 then their sides are in AP