# the complex plane   5 videos

• #### Parallel Planes and Lines

##### GeometryGeometry Building Blocks

How to identify parallel lines, a line parallel to a plane, and two parallel planes.

parallel lines skew plane
• #### Three Undefined Terms: Point, Line, and Plane

##### GeometryGeometry Building Blocks

How to describe and label point, line, and plane. How to define coplanar and collinear.

point line plane coplanar collinear
• #### Calculating the Midpoint

##### GeometryGeometry Building Blocks

How to find the midpoint of a segment with endpoints in rectangular coordinates, How to write the midpoint formula.

endpoint coordinate plane
• #### Distance Formula

##### GeometryPythagorean Theorem

How to derive the equation for the distance between two points using the Pythagorean Theorem.

distance coordinate plane ordered pair segment
• #### Locus and Definition of a Circle and Sphere

##### GeometryCircles

How to define a circle and a sphere using the word locus.

locus set of points distance plane circle sphere given