Angles
An angle measuring less than 90 degrees
Acute Angle
Lines in the same plane that never intersect and are always the exact same distance apart.
Parallel Lines
An exact location in space that has zero size, no width, and no length.
Point
A closed, 2D shape made with straight lines (e.g., triangles, squares).
Polygon
A 3D solid object bounded by six identical, square faces.
An angle measuring exactly 90 degrees (forms a perfect "L" or square corner)
Right Angle
Two intersecting lines that form a right angle
Perpendicular Lines
A completely flat, two-dimensional surface that extends infinitely in all directions.
Plane
A polygon with exactly 3 sides.
Triangle
A 3D solid with two parallel, identical circular bases joined by a curved surface.
Cylinder
An angle measuring greater than 90 degrees but less than 180 degrees
Obtuse Angle
A part of a line that starts at one fixed point and extends infinitely in only one direction.
Ray
The corner point where two or more rays or line segments meet
Vertex
A polygon with exactly 4 sides.
Quadrilateral
A 3D solid that has a single circular base and tapers smoothly to a single point (vertex) at the top.
Cone
An angle measuring exactly 180 degrees
Straight Angle
A perfectly straight path of points that extends infinitely in both directions with no endpoints.
Line
Two angles whose measures add up to 90 degrees
Complementary Angles
A perfectly round 2D shape where all points on the outer edge are the exact same distance from the center.
Circle
A 3D solid with two identical, flat ends (bases) and flat sides.
Prism
Two angles whose measures add up to 180 degrees
Supplementary Angles
A specific portion of a line with two distinct, fixed endpoints.
Line Segment
A straight line that passes perfectly through the center of a circle, connecting two points on the edge.
Diameter
A perfectly round 3D ball where all points on the surface are equidistant from the center.
Sphere
Any flat surface of a solid, three-dimensional shape.
Face