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Junior high school seventh grade math problem! ! ! Unit 4! !
CD= 10

Because AB: BC: CD = 2: 6: 5, AB=4 BC= 12.

Then AD=26 MD= 13.

MC=MD-CD=3

∠AOC+24=∠BOC=∠BOD+∠DOC

∠DOC =∠AOC+24-∠BOD =∠AOD-∠DOC+24-∠BOD =-∠DOC = 24

2∠DOC=24

∠DOC= 12

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