AF=AD=BC=10
BF²=AF²-AB²=10²-8²=36
BF=6
FC=BC-BF=10-6=4,
DE=EF,EC=DC-DE=AB-DE=8-DE
EF=DE
EF²=EC²+FC²=(8-DE)²+4²
DE²=64-16DE+DE²+16
16DE=80
DE=80/16=5.
EC=8-DE=8-5=3.
AF=AD=BC=10
BF²=AF²-AB²=10²-8²=36
BF=6
FC=BC-BF=10-6=4,
DE=EF,EC=DC-DE=AB-DE=8-DE
EF=DE
EF²=EC²+FC²=(8-DE)²+4²
DE²=64-16DE+DE²+16
16DE=80
DE=80/16=5.
EC=8-DE=8-5=3.