Explaination of question 4 in exercise 6.1
Divyanshbh1:
which class
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x+y = 180 degree
x+y+w+z = 360 degree
x+y+x+y = 360 degree [ because in question it is given that x+y = w+z]
2x+2y =360 degree
2( x+y) = 360 degree
x+y = 360/2
x+y = 180 degree
AOB is a straight line
x+y+w+z = 360 degree
x+y+x+y = 360 degree [ because in question it is given that x+y = w+z]
2x+2y =360 degree
2( x+y) = 360 degree
x+y = 360/2
x+y = 180 degree
AOB is a straight line
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