KAPEC GEOTASK?
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  • The solved tasks turn into coordinates
  • The chance to follow your progress
  • Along with your schoolmates and friends, go on an adventure, searching for hideouts
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1723.3. Triangle angle sum, straight angle cathetus, hypotenuse, Right-angled triangle similarity signs.

Give ∠ABC = ∠DFE = 90°!


Is ∆ABC = ∆DFE, if DE = AB and ∠ACB = ∠DEF?
Grade:
7
Subject
Geometry
Theme
Triangle angles sum. Right-angled triangle similarity signs.
Subtheme
Triangle angle sum, straight angle cathetus, hypotenuse, Right-angled triangle similarity signs.

Solve tasks to find hidden Geo point coordinates

  1. Algebra: Equation roots.
  2. Geometry: Triangle and its elements, angle opposite and adjacent edge, opposite and adjacent angle in triangle. Triangle median, bisector, height, triangle inequality.
  3. Algebra: Numerical inequalities and their properties.
  4. Algebra: Ordinate axis
  5. Algebra: Polynomial.
  6. Geometry: Point belongs (or not) to the straight line (beam, line segment), half-plane, crossed straight lines, beam, opposite beams, line segment, properties.
  7. Algebra: Linear function y = kx + b
  8. Geometry: Broken line and elements, elementary broken line, closed broken line, broken lines length, polygon, angles, edges peaks, diagonal, polygon perimeter.
  9. Algebra: Fraction (division) basic properties
  10. Algebra: Coordinate plane