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CBSE Class 10 Answered

from units TRIANGLES
Asked by | 09 Mar, 2009, 11:35: PM
Expert Answer

Draw the diagram as mentioned in the question.

Let CD be theperpendicular from C to AB.

Acc to question,

AB=c,BC=a, AB=c,CD=p

CAB is a right triangle and so is DCB.

angle BDC= angle BCA( each is 90 )

angle DBC= angle ABC(common angle to both triangles)

So,

 triangle DCB similar to triangle CAB(AA rule)

DC/CA=CB/AB( corr sides of similar trianglesaa re proportional)

p/b=a/c

1/p=c/ab

squaring both sides,

solving one step further we get the answer.

 

Answered by | 10 Mar, 2009, 12:51: PM
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