Question

write the value x in the following figure​

Answer 1

Step-by-step explanation:

let the third angle be a

a+123°=180°{linear pair angle}

a=180-123

a=57°

56°+57°+x=180°{angle sum property of triangle }

113+x=180

x=180-113

x=67°

to check :-

56+57+67=180

180=180

LHS=RHS

hence proved ......

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Answer 2

Step-by-step explanation:

$angle \: acb = 180 - 123 = 57 \: \: \: \: \: (sum \: of \: supplementary \: angle)$

$x = 180 - 57 - 56 = 67 \: \: \: \: (sum \: of \: triangle = 180)$