Geometry: The study of shapes and their properties
Below are some terms that we learned during our geometry unit in math.
Angles: 2 rays joined by a vertex
Acute: 0-89 degrees (less than 90)
Right: exactly 90 degrees
Obtuse: 91-179 degrees (greater than 90, less than 180)
Straight: exactly 180 degrees (a line or line segment)
Acute: 0-89 degrees (less than 90)
Right: exactly 90 degrees
Obtuse: 91-179 degrees (greater than 90, less than 180)
Straight: exactly 180 degrees (a line or line segment)
Polygons: Closed figures made up of line segments
Regular Polygons: All the angles have the same degrees; all the
sides are the same length
Irregular Polygons: The sides and angles have different
measurements
Regular Polygons: All the angles have the same degrees; all the
sides are the same length
Irregular Polygons: The sides and angles have different
measurements
Triangles: Polygons with 3 sides and 3 angles; Triangles can be classified using 2 names: 1 to describe the lengths of the sides and 1 to describe the angles inside
Sides:
Equilateral: All sides are the same length
Isosceles: 2 of the sides have the same length
Scalene: Each side has a different length (no sides the same)
Angles:
Right: Has one 90 degree angle
Acute: All 3 angles are acute (all less than 90 degrees)
Obtuse: 1 angle is obtuse (between 90 and 180 degrees)
Sides:
Equilateral: All sides are the same length
Isosceles: 2 of the sides have the same length
Scalene: Each side has a different length (no sides the same)
Angles:
Right: Has one 90 degree angle
Acute: All 3 angles are acute (all less than 90 degrees)
Obtuse: 1 angle is obtuse (between 90 and 180 degrees)
Examples of triangles:
Quadrilaterals: Polygons with 4 sides and 4 angles; more specific names are given based on the number of parallel sides, the number of sides of equal length, and the measurements of the angles. Some shapes can be classified by multiple names: a square is a type of rectangle, a rhombus is a type of parallelogram, etc.
