A right angle measures exactly 90°, like a square corner. An acute angle measures less than 90°, looking sharp and narrow. An obtuse angle measures more than 90° but less than 180°, appearing wider than a right angle.
Class 5 Mathematics Maths-Mela Chapter 3 Angles as Turns question answer
Class 5 NCERT Maths-Mela Chapter 3 Angles as Turns solution
Angles are defined by their size. A right angle is exactly 90°, like the corner of a square. An acute angle is less than 90°, sharp and narrow, often seen in triangles or pizza slices. An obtuse angle is greater than 90° but less than 180°, appearing wide and open, such as the slope of a roof. These differences help classify angles in geometry.
More clearly:
Right is exact, acute is sharp and small, obtuse is wide and larger.
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