Plane Geometry

What is a point in geometry?

A point is a precise location or position in space, typically represented by a dot.

What is a line segment?

A line segment is a part of a line that is bounded by two distinct endpoints.

Define a ray.

A ray is a line that starts at a point and extends infinitely in one direction.

What is an angle?

An angle is formed by two rays sharing a common endpoint, called the vertex.

What are parallel lines?

Parallel lines are lines in a plane that never intersect and are always the same distance apart.

Define intersecting lines.

Intersecting lines are lines that cross each other at a single point.

What is a circle?

A circle is the set of all points in a plane that are a fixed distance from a central point.

What is the radius of a circle?

The radius is the distance from the center of the circle to any point on its perimeter.

Define a polygon.

A polygon is a closed plane figure formed by three or more line segments.

What is the difference between a convex and concave polygon?

A convex polygon has all interior angles less than 180 degrees, while a concave polygon has at least one interior angle greater than 180 degrees.