Geometry · Points, Lines & Angles
Acute Angle
HSG-CO.A.1
Definition
An angle that measures greater than 0 and less than 90 degrees.
Examples
- 45 degrees is an acute angle.
- 10 degrees is an acute angle.
Key rule
An acute angle is always smaller than a right angle.
Memory hook
A small, 'cute' angle — under 90 degrees.