Perpendicular Intersections 2

Directions

In the picture Angle ADC and Angle BDC are congruent. What other details do we know about Angle ADC and Angle BDC? What relationship does Line AB and Line DC have?

New Resources

Intersections of y=a^x and y=log(a, x)
Variation Theory Illustration: Point-Slope Form
Involute of the Circle
The 3D Space
Padel rebound angle (ignoring spin)

Discover Resources

Locus2
Fixed Right angled triangle
Geogebra Project
Net of a Cone

Discover Topics

Dilation
Natural Numbers
Isosceles Triangles
Reflection
Equilateral Triangles