alleryOpening two rays into a flat straight line makes an angle of how many degrees?
A90°
B180°
C270°
D360°
Answer & Solution
Correct answer: B. 180°
1. A straight angle is half of a full turn.
2. Half of 360° is 180°.
3. 90° is a right angle and 360° is a full angle.
_Source: Wikipedia, Angle, Common angles_
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