8th Grade · Geometry
Right Angle
8.G.B.7
Definition
An angle that measures exactly 90°, forming a square corner. It is marked with a small square symbol rather than an arc.
Examples
- The corner of a page is a right angle.
- Acute < 90°, right = 90°, obtuse > 90°.
Key rule
A right angle is marked with a small square, not an arc.
Memory hook
Exactly 90°, a perfect square corner.