ab=6 bc=8 de=5 qualdilateral
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HERE, AB=6 CM
BC=8 CM
FOR TRIANGLE ABC
AB^2+ BC^2=AC^2
(6)^2+(8)^2=
36+64=
100=AC^2
10CM=AC
AE=EC
EC=1/2 AC
=1/2(10)
=5CM
FOR TRIANGLE DEC
DC^2=DE^2+EC^2
=(5)^2+(5)^2
=25+25
DC^2=50CM
DC=5√2CM
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