oblique angle

Thân thiện

A student measures an oblique angle on a geometry worksheet.

Definition

Noun: An angle that is not a right angle (90 degrees) or a multiple of a right angle (e.g., 180, 270 degrees). It is any angle that is not exactly 0°, 90°, 180°, 270°, or 360°.

Usage

The term "oblique angle" is used in geometry to classify and describe angles. It specifies that an angle is neither a right angle nor a straight angle (or their multiples), meaning it is acute (less than 90°) or obtuse (greater than 90° but less than 180°).

Examples

• The triangle contained two oblique angles and one right angle.
• In the diagram, lines AB and CD intersect at an oblique angle.
• Most road junctions meet at oblique angles rather than perfect right angles.

Advanced Usage

• Oblique Triangle: A triangle that does not contain a right angle. All three of its interior angles are oblique angles.
  • Example: Solving an oblique triangle often requires using the Law of Sines or the Law of Cosines.

Variants and Related Words

• Oblique (Adjective): Slanting; not straight, direct, or perpendicular.
  • Example: The satellite captured an oblique photograph of the city from a sharp angle.
• Acute Angle: An oblique angle that is less than 90 degrees.
• Obtuse Angle: An oblique angle that is greater than 90 degrees but less than 180 degrees.

Synonyms

• Non-right angle
• Slant angle

Antonyms

• Right angle
• Perpendicular angle
• Straight angle (180°)

Học thuật

Noun

1. an angle that is not a right angle or a multiple of a right angle