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NCERT Class 8 Mathematics Chapter 4 Practical Geometry CBSE Board Sample Problems

Practical Geometry

Condition for Uniquely Drawing the Triangle

  • We need three measurements for uniquely drawing the Triangle
  • Three measurement could be (Two sides, One Angle) , (Three sides) and (2 angles, 1 side) .

Condition for Uniquely Drawing the Quadrilaterals

Five measurements can determine a quadrilateral uniquely

Here is some the measurements which will help us uniquely draw the quadrilaterals

  • A quadrilateral can be constructed uniquely if the lengths of its four sides and a diagonal is given.
  • A quadrilateral can be constructed uniquely if its two diagonals and three sides are known.
  • A quadrilateral can be constructed uniquely if its two adjacent sides and three angles are known.
  • A quadrilateral can be constructed uniquely if its three sides and two included angles are given
  • Some special property can help in uniquely drawing the quadrilaterals.

Example

  • Square with side given
  • Rectangle with side given
  • Rhombus with diagonals given