recall the definition of straight angle and right angel
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straight angle changes the direction to point the opposite way. It looks like a straight line.
It measures 180° (half a revolution, two right angles, or πradians)
Right angle
the angle bounded by two lines perpendicular to each other : an angle of 90° or ¹/₂ π radians
It measures 180° (half a revolution, two right angles, or πradians)
Right angle
the angle bounded by two lines perpendicular to each other : an angle of 90° or ¹/₂ π radians
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