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

Answer :

ASolution :

`angleA+angleB+angleC=360^(@)`. <br> Make of the angles as the subject. <br> (ii) Given, `A+B+C+D=360^(@)`, make A,B,C and D as subjects.