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Glite Dictionary
acute triangle

acute triangle

3.9
A triangle with all three angles less than 90 degrees
  • noun
  • /əˈkjuːt ˈtraɪæŋɡəl/
  • Specialized
translation icon : triángulo acutángulo
  • To form an acute triangle, you must ensure that all three angles measure under 90 degrees.

Examples

  • "Nothing more than an acute triangle with three simple vertices.

    Fiction book (1991)

  • An acute triangle has three angles that are all less than 90 degrees.

  • In geometry class, we learned that an acute triangle is one where each angle is acute.

Synonyms

acute-angled triangle
vsacute triangle
  • Specialized
3.2

A triangle in which all three angles are less than 90 degrees

is the same meaning but uses a shorter non hyphenated form

How Pointed

acute triangle
  • Specialized
3.9
right triangle
  • Specialized
2 3.2
obtuse triangle
  • Specialized
1 3.3

Surface Forms

acute triangle singular
acute triangles plural

Morphology

acute + triangle

The meaning 'a triangle with all angles less than 90 degrees' is directly derivable from combining 'acute' (referring to an acute angle) with 'triangle' (a three-sided figure). This is a transparent, compositional technical term common across languages and in basic geometry, so a B1 learner who knows the constituent words can understand it.

Etymology

The term acute triangle comes from the old word acute, which means 'sharp' or 'pointed', so you can imagine the angles as small, sharp points. That's why an acute triangle means a triangle with all angles 'less than 90 degrees'.