Definition

Noun: A triangle that has one interior angle measuring more than 90 degrees (an obtuse angle) and less than 180 degrees. The other two interior angles are each less than 90 degrees (acute angles).

Usage

The term "obtuse triangle" is used in geometry to classify a triangle based on the measure of its largest interior angle. It describes the shape's specific property.

Examples

• In geometry class, we learned that an obtuse triangle has one angle greater than 90 degrees.
• The roof's gable end formed an obtuse triangle.
• You can identify an obtuse triangle if the square of the length of its longest side is greater than the sum of the squares of the other two sides.

Advanced Usage

• Obtuse-angled triangle: This is a full, formal synonym for "obtuse triangle."
  • The problem specifically asked to calculate the area of an obtuse-angled triangle.

Variants and Related Words

• Obtuse-angled triangle (n): A full term for an obtuse triangle.
• Acute triangle (n): A triangle where all three interior angles are less than 90 degrees.
• Right triangle (n): A triangle that contains one 90-degree interior angle.
• Obtuse angle (n): An angle that measures more than 90° and less than 180°.

Synonyms

• Obtuse-angled triangle

Antonyms

• Acute triangle
• Right triangle

Noun

1. a triangle that contains an obtuse interior angle