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

Is this statement true?

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