Learn about properties of triangles with this BBC Bitesize Maths article. ... An obtuse-angled triangle has one angle that is greater than 90° and less than 180°.

Discusses the properties and types of triangles, explaining that a triangle is a closed figure with three sides and angles. It categorizes triangles into equilateral, isosceles, scalene, obtuse ...

The three doweled pieces of this unpainted wooden model can be arranged either as a rectangle or as an obtuse-angled triangle. Compare models 1985.0112.190 through 1985.0112.202. For further ...

SPRINGFIELD — A group dedicated to the preservation of historic properties in the city has revealed its 2021 “most endangered” list, including the addition of the Apremont Triangle area.