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21. given - y+z=3x
y+z+x=180( linear angle)
3x+x=180
4x=180
x=180÷4=45( answer)
22. 5x+4x=180( linear angle)
9x=180
x=180÷9=20
AOC= 4x=4×20=80
COB=5x=5×20=100
AOC=BOD ,COB=DOA (vertically opposite angle)
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