proportional 18 videos

Proportions
Algebra Solving Equations
How to solve proportions.
ratio proportion fraction cross multiply 

Law of Definite Proportions  Law of Multiple Proportions
Physics The Atom and Quantum Physics
Understanding the laws of definite and multiple proportions.
law of definite proportions law of multiple proportions matter dalton's law compounds 
Law of Definite Proportions  Law of Multiple Proportions
Chemistry Matter
Understanding the laws of definite and multiple proportions.
law of definite proportions law of multiple proportions matter dalton's law compounds 
Proportional Segments Between Parallel Lines
Geometry Similarity
How to prove two triangles are similar using a line parallel to a base.
parallel lines triangles similar triangles proportion 
Percents
Algebra PreAlgebra
How to set up percent problems as proportions.
percent cross multiply proportion 

Similar Triangles
PreAlgebra Introductory Geometry
Overview of similarity: congruent angles, proportional corresponding sides

Direct Variation
Algebra 2 Functions
How to define direct variation.
direct variation proportional constant of variation 
Similarity Shortcuts
Geometry Similarity
How to determine if two triangles are similar using a shortcut.
similar triangles AA SAS SSS proportion congruence 
Corresponding Parts of Similar Triangles
Geometry Similarity
How to relate corresponding altitudes, medians and angle bisectors in similar triangles.
similar triangles altitude median angle bisector proportional 
Angle Bisectors and Opposite Side Ratios
Geometry Similarity
How to relate the sides of an angle bisected and the lengths of the opposite side.
angle bisector opposite side ratio proportion 
Indirect Variation
Algebra 2 Functions
How to define indirect variation.
indirect variation inverse proportion constant of variation 
ACT PreAlgebra
ACT ACT Math
Short, helpful video on ACT prealgebra by top ACT prep instructor, Devorah. Videos are produced by leading online education provider, Brightstorm.
Pre algebra order of operations percents proportions ratios mean median mode 
Constructing the Centroid
Geometry Constructions
How to identify the centroid and the way it divides each of the medians.
point of concurrency center of mass center of gravity centroid proportional segments construct 
Secants
Geometry Circles
How to define a secant; how to find the length of various secants in circles.
secant intercepted arcs proportion arc measure tangent chord 
Properties of Similar Polygons
Geometry Similarity
How to identify if two figures are similar.
similar figures corresponding angles congruence corresponding sides proportional