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Two right angles are formed during each hourly period 4-5, 5-6, 6-7, 7-8, 8-9.
However, when the clock reaches 9pm, this coincides with the second 90° between the hours of 8-9. The clock has then to reach approximately 9.34pm for the only occasion when the hands will be at 90° in the hour 9-10.
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A 90 degree angle is a right angle
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A 90 degree angle is formed at a right angle.
A reflex angle.
A 120-degree angle is an obtuse angle, meaning it is greater than 90 degrees but less than 180 degrees. It is formed when two lines intersect and the angle between them measures 120 degrees. In a triangle, a 120-degree angle would typically be found at one of the vertices.