right-angled triangle
nounUK /ˌraɪt ˈæŋɡəld ˈtraɪæŋɡəl/
US /ˌraɪt ˈæŋɡəld ˈtraɪæŋɡəl/
A right-angled triangle is a triangle with one corner that makes a perfect square corner.
The carpenter drew a right-angled triangle to check that the shelf was straight.
RELATED WORDS
OTHER MEANINGS
2. In trigonometry, a triangle used to define sine, cosine, and tangent ratios.
We used a right-angled triangle to find the tangent of 30 degrees.
3. A shape often used in building and design to create strong, stable corners.
The roof frame included a right-angled triangle for extra strength.
4. A triangle whose two shorter sides meet at exactly 90 degrees.
The two shorter sides of the right-angled triangle meet at a right angle.