Question

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}
]

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

Solution