Question

find its measure ( of angle PQR)
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Answer 1

Answer:

extr. angle=sum of intr.angles.... (i)

2x =y(corresponding angle)

x=2l(alternate angle) (2)

QPR + 2x = 2 y=2x2x. as per(1)

QPR + 2x=4x

QPR +42=84. as per (2)

QPR = 84-42=42. Ans.