Parallel sides cut proportionally APS

Directions

Move point D along segment AC. Notice the slopes (shown in red) of segments DE and AB (what does this tell you about lines DE and AB? What happens to the ratios

and

as you move point D?

New Resources

Congruent Sides & Angles in △s: Exploration
Slope Illustrator (2)
繪畫垂直線
Perpendicular Lines: Quick Exploration
Absolute Value Functions f(x)=a |x - h| + k

Discover Resources

Geogebra Tutorial: Line Design Complete
fernando gomez quadrilateral #4
H2M 2014 P1 Q3
Triangle Sum Theorem Discovery
Where does the name for the secant function come from?

Discover Topics

Geometric Mean
Power Functions
Geometric Distribution
Ratios
Solids or 3D Shapes