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Question

In figure 3.51, in ΔABC, seg AD and seg BE are altitudes and AEBD.
Prove that seg AD seg BE
1061104_bbf4a52040a14abdaf56c728a9e17c8f.png

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Solution

Let the point of inter-section of altitudes be x,
in DXB,
EXA=BXD (vertically opposite angles)
XEA=XDB (Right angles)
and AE=BD
So, DXBEXA
and thus, EX=XD (CPCT) i
and XB=XA (CPCT) ii
Adding i and ii , we get...
BE=AD.
Hence proved.

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