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Acute Angle Definition. An acute angle is an angle whose degree measure is greater than 0 but less than 90. In the above diagram angle 1 is seen smaller than the right angle marked by a square sign. Hence it is an acute angle. Similarly, the angle marked as 2 is called the complementary angle of angle 1.
Definition: An angle whose measure is exactly 90Â°. Try this Adjust the angle below by dragging an orange dot and see how the angle â  ABC behaves. Note that it is a right angle only when its measure is exactly 90Â°. Right angles are one of the most common and interesting angles in all of geometry.It even has its own angle symbol. In the figure above, set the angle to 90Â° and see that instead of a small arc, the angle is marked with a small square symbol. If you see this, the angle measure in degrees is usually omitted.Note also that right triangles are those where one interior angle is a right angle.n the figure above, set the angle to 90Â° and see that instead of a small arc, the angle is marked with a small square symbol. If you see this, the angle measure in degrees is usually omitted. Note also that right triangles are those where one interior angle is a right angle.