Acute angle
Definition
An acute angle is an angle that measures less than 90 degrees. It is one of the basic classifications of angles in geometry.
5 Must Know Facts For Your Next Test
- An acute angle can range from greater than 0 degrees to less than 90 degrees.
- When two acute angles are adjacent, their sum can still be less than or equal to 90 degrees, making another acute or a right angle.
- Acute angles are often found in various geometric shapes, such as triangles and polygons.
- A triangle with all three angles being acute is called an acute triangle.
- In trigonometry, sine and cosine values for acute angles are always positive.
Review Questions
- What is the range of measurements for an acute angle?
- Can two adjacent acute angles form a right angle?
- What type of triangle has all three angles as acute?
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Related terms
RightAngle: An angle that measures exactly 90 degrees.
ObtuseAngle: An angle that measures more than 90 degrees but less than 180 degrees.
ComplementaryAngles: Two angles whose measures add up to exactly 90 degrees.
