1.

The side BC of ΔABC is produced to D. If ∠ACD = 114° and ∠ABC= (1/2)∠BAC, then what is the value of ∠BAC ?​

Answer»

\huge\sf\red{Given\::}

  • \sf \angle ACD\: = \:114\degree
  • \sf \angle ABC\:=\:\dfrac{1}{2}\:\angle BAC

\huge\sf\blue{To\:Find\::}

  • \sf The\: value\:  of \:\angle BAC

\huge\sf\purple{Solution\::}

\sf Let,

  • \sf \angle ABC \: = \: x
  • \sf \angle BAC \:=\: 2x

\sf\underline{Now,\:By\:using\: exterior\: angle\: property}

\longrightarrow\:\:\sf \angle BAC \:=\:\angle ABC \:=\: \angle ACD

\longrightarrow\:\:\sf 2x\:+\:x\:=\:144\degree

\longrightarrow\:\:\sf 3x\:=\:144\degree

\longrightarrow\:\:\sf x\:=\:\dfrac{\cancel{144\degree}}{\cancel{3}}

\longrightarrow\:\:\sf x\:=\:38\degree

\sf Put \:the\:x\: value\:in\:\angle BAC

\longrightarrow\:\:\sf 2\:\times\:38\degree

\longrightarrow\:\:\sf 76\degree

\sf\star\:\:\underline\pink{Hence, \:\angle BAC\:is\:76\degree}



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