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One-fourth of a revolution = 90° (a right angle).

Full revolution = 360°
360° ÷ 4 = 90°

Fraction	Angle
1 revolution	360°
1/2	180° (straight angle)
1/4	90° (right angle)
1/8	45°
1/3	120°

One-fourth of a revolution equals 90°, known as a right angle, since a full revolution spans 360°.

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