19.In the following figure AOB is a line, then x=? (a)180° (b)135 (C)45° (d)90°
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Step-by-step explanation:
x=45°
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In figure AOB is line
45+3x=180
3x=180-45
3x=135
x=135/3
x=45
45+3x=180
3x=180-45
3x=135
x=135/3
x=45
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