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673.1. Air composition and usage(reactions).

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When inhaling and exhaling the air, the content of the oxygen decreases from 21 % to 16 %.
Air and its quality.
Air composition and usage(reactions).

Solve tasks to find hidden Geo point coordinates

  1. Geometry: Area of parallelogram, rhomb, triangle, right angled triangle and trapeze.
  2. Geometry: Rectangular (S = ab, a, b - edges) and area of the square (S=a^2 , a - edge) formula.
  3. Geometry: Diameter, which is perpendicular to chord, properties.
  4. Algebra: Numerical approximation.
  5. Algebra: Rational fraction expression.
  6. Geometry: Curve angle value, center angle and indrawn angle.
  7. Algebra: Square root extraction
  8. Algebra: Parabola.
  9. Geometry: Triangle median properties.
  10. Chemistry: Substances physical properties and transformations.