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Biswajit sahoo

· started a discussion

· 1 Months ago

wrong answer (Question:694593.0)

as A=20 AOC should be 2A= 40

Question:

The circumcentre of a triangle ABC is O. If ∠BAC 85° and ∠BCA = 75°, then the value of \(\angle \)COA?

Options:
A)

40°

B)

60°

C)

70°

D)

90°

Solution:

Given-

∠BAC = 85°

∠BCA = 75°

∠ABC+∠BCA+∠CAB=180∘ 

∠ABC=20∘

∴∠COA=2×∠ABC

∠COA=2×20=40∘


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