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811.2. Opposite, adjacent angles, perpendiculars against a straight line.

Is this statement true?

If given ∠α = ∠CAD, it is possible to prove that ∠α = ∠β.
Opposite and Adjacent angles.
Axiom, theorem, verifcation.

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Proportionality factor k
  2. Algebra: Function
  3. Algebra: Mathematical expression. Algebraic expression.
  4. Algebra: Numerical inequalities and their properties.
  5. Algebra: Fraction (division) basic properties
  6. Algebra: Connection concept
  7. Algebra: Equivalent inequalities
  8. Algebra: Similar monomials
  9. Algebra: Coordinate plane
  10. Algebra: Degree with negative index
  11. Algebra: Coordinate beginning point
  12. Algebra: Ordinate axis
  13. Algebra: Equation roots.
  14. Geometry: Triangle angle sum, straight angle cathetus, hypotenuse, Right-angled triangle similarity signs.
  15. Algebra: Mathematics expression. Algebraic expression.
  16. Geometry: Broken line and elements, elementary broken line, closed broken line, broken lines length, polygon, angles, edges peaks, diagonal, polygon perimeter.
  17. Algebra: Contracted multiplication formula: addition and subtraction square; square difference.
  18. Algebra: Number gap and their types.
  19. Algebra: Concept of equation.
  20. Algebra: Function y = x²
  21. Algebra: Diagram y = kx + b (drawing)
  22. Algebra: Polynomial.
  23. Algebra: Concept of equation.
  24. Geometry: Angle, angle edges and peak, value, degree, measurement.
  25. Algebra: Percent and proportions
  26. Algebra: Identical expressions.
  27. Algebra: Linear function y = kx + b
  28. Geometry: Triangle and its elements, angle opposite and adjacent edge, opposite and adjacent angle in triangle. Triangle median, bisector, height, triangle inequality.
  29. Algebra: Linear equations ax + b = 0, where a, b ∈ Q.
  30. Algebra: Numerical equalities.
  31. Geometry: Opposite, adjacent angles, perpendiculars against a straight line.
  32. Algebra: Subscript concept: base, index, degree
  33. Geometry: Point belongs (or not) to the straight line (beam, line segment), half-plane, crossed straight lines, beam, opposite beams, line segment, properties.
  34. Algebra: Proportionality factor k
  35. Algebra: Numerical inequalities and their properties.
  36. Algebra: Trinomial.
  37. Algebra: Polynomial normal form.
  38. Algebra: Numerical expression.
  39. Geometry: Concept definition, concept sign.
  40. Algebra: Functions expression with formula, table, diagram
  41. Algebra: Number gap and their types.
  42. Algebra: Abscissa axis