21. Find the value of z. B С 2/4 A 2/3 X 216 (1) 120° (3) 180° (2) 240° (4) 360°

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As all the angles formed on a straight line [ begin{array}{l} therefore angle A O B+angle B O C+angle C O D=180 Rightarrow frac{Z}{3}+frac{Z}{4}+frac{Z}{6}=180 frac{4 Z+3 Z+2 Z}{12}=180 frac{92}{12}=18020 end{array} ]

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