The question may seem simple. Could we have a line forming an angle of 150° (for example). Thanks.
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1A straight line, by definition, is created by a straight angle, which is $180^\circ$. – Andrew Li Mar 29 '18 at 05:02
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Draw a line perpendicular to the line and note that there are two right angles at the point of intersection. Easy as $\pi$. – copper.hat Mar 29 '18 at 05:02
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If two rays form an angle other than $180^\circ$, then it is not a straight line. A straight line, by definition, is $180^\circ$.
A rotation of $150^{\circ}$ is only a fraction of straight angle rotation viz.,
$$\frac {150^{\circ}}{180^{\circ}}=\frac {5}{6}.$$
Narasimham
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Andrew Li
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A degree (in full, a degree of arc, arc degree, or arcdegree), is a measurement of a plane angle, defined so that a full rotation is $360$ degrees (from Wikipedia).
So, any line in a plane should divide a plane into two parts, each part is half of the rotation so a straight line froms an angle of $180^\circ$.
user061703
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Total $ 360^{\circ} $ at a point is divided exactly into two halves; so by definition a straight line without direction change ( a shoot through) is a straight angle.
Narasimham
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