1.

In AABC, if AD is the median, then show that AB2+AC2 2(AD+BD2)

Answer»

AD is median, So BD=DC.

AB^2= AE^2+BE^2

AC^2 = AE^2+EC^2

Adding both,

AB^2+AC^2 = 2AE^2+BE^2+CE^2

= 2(AD^2-ED^2)+(BD-ED)^2+(DC+ED)^2

= 2AD^2-2ED^2+BD^2+ED^2-2BD.ED+DC^2+ED^2+2CD.ED

= 2AD^2+BD^2+CD^2

= 2(AD^2+ BD^2)

hit like if you find it useful



Discussion

No Comment Found