In the figure find b in terms of a c & d.
The right answer is b = c + d - a.
x = 360 - b
w = 360 - a
m + w + x = 180
⇒ m = a + b - 540
Y = 360 - c and z = 360 - d
Therefore a + b - 540 + 360 - c + 360 - d = 180
⇒a + b = c + d. answer is option (a)
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