acute triangle
All angles small
An acute triangle is a triangle in which all three interior angles measure less than 90 degrees.
This distinguishes it from right triangles (one 90-degree angle) and obtuse triangles (one angle greater than 90 degrees).
The roof formed an acute triangle against the sky.
Having all sides congruent
- isoscelesTwo sides match
- scaleneAll sides unequal
- verticesCorner points of shapes
- interior anglesAngles inside a polygon
circumcircle · centroid · orthocenter · circumcenter · incenter · median · altitude · angle bisector
Having all sides congruent
- isoscelesTwo sides match
- scaleneAll sides unequal
- obliqueAngled, not straightforward
- angle measurementAssessing angular magnitude
Device showing cardinal directions
- straightedgeLine-drawing tool
- protractorAngle-measuring instrument
- rulerOne who governs
- bisectDivide into two equal portions
inscribed · circumscribed · vertices · perpendicular · parallel lines · drafting
equilateral
Having all sides congruent
interior angles · circumcircle · centroid · orthocenter · circumcenter · incenter · median · altitude · angle bisector · congruence
equilateral
Having all sides congruent
compass
Device showing cardinal directions
- straightedgeLine-drawing tool
- protractorAngle-measuring instrument
- rulerOne who governs
bisect · inscribed · circumscribed · vertices · perpendicular · parallel lines · drafting
- Trianglesequilateral, isosceles, scalene, hypotenuse, vertex
- polygonspolygon, quadrilateral, pentagon, hexagon, heptagon
- shapescircle, square, rectangle, oval, hexagon
acute triangleobtuse triangle
Triangle with angle over ninety
right triangle · right-angled triangle · scalene triangle · isosceles triangle · equilateral triangle
acute, triangle, acutely, acuteness, triangular, triangulate, triangulation, triangulated, triangulating