-
- acute angle
-
- acute triangle
-
- adjacent sides
-
- angle
-
- circle
-
- degree (°)
-
- diagonal of a quadrilateral
-
- endpoint
-
- equilateral triangle
-
- intersecting lines
-
- isosceles triangle
-
- kite
-
- line
-
- line of symmetry
-
- line segment
-
- line symmetry
-
- obtuse angle
-
- obtuse triangle
-
- opposite sides
-
- parallel lines
-
- parallelogram
-
- perpendicular lines
-
- point
-
- polygon
-
- protractor
-
- quadrilateral
-
- ray
-
- reflex angle
-
- rhombus
-
- right angle
-
- right triangle
-
- scalene triangle
-
- straight angle
-
- trapezoid
-
- Venn diagram
-
- vertex of an angle
-
- vertex of a polygon
