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What are the auxiliary formulae of the s...

What are the auxiliary formulae of the statement "sum of the angles of a quadrilateral ABCD is `360^(@)`," (The four angles of the quadrilateral are A,B,C and D)?

A

` A = 360^(@) - (B+ C+ D)`
` B = 360^(@) - (A+C+D)`
` C = 360^(@) - (A+B+D)`
` D = 360^(@) -(A+B+C)`

B

` A = 360^(@) -(B+C+D)`
` B = 360^(@) -(A+C+D) `
`C = 360^(@) -(A+B+D) `
` D = 360^(@) -(A-B+C) `

C

` A = 360^(@) -(B+C+D)`
` B = 360^(@) -(A-C+D) `
` C = 360^(@) -(A+B+D)`
` D = 360^(@) -(A+B+C)`

D

` A = 360^(@) -(B+C+D)`
`B = 360^(@) -(A+C+D) `
`C = 360^(@) -(A-B+D) `
` D = 360^(@) -(A-B+C)`

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The correct Answer is:
A
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