math

• Trapezoid


  A quadrilateral with one pair of parallel sides
• Parts of a trapezoid

  • Bases (parallel sides)
  • Legs (nonparallel sides)
  • Base angles (angles formed by a base and one of the legs)
• Isosceles trapezoid


  A trapezoid whose nonparallel sides (legs) are congruent
• Properties of an isosceles trapezoid

  1. the consecutive angles between bases are supplementary
  2. Each pair of base angles are congruent
  3. The diagonals are congruent
• Kite


  A quadrilateral that does not have any parallel sides and has two pairs of consecutive congruent sides
• Properties of a kite

  • The non-vertex angles are congruent
  • The diagonals are perpendicular
  • The diagonal connecting the vertex angles is the perpendicular bisector of the other diagonal
  • The vertex angles are bisected by a diagonal
• ratio

  • comparison of two quantities in colon form or fraction form
• proportion

  statement that two ratios are equal
• direct proportion

  one quantity increases/decreases, the other quantity also increases/decreases
• inverse proportion

  wherein one property increases/decreases the other increases
• partitive proportion

  when a whole is divided into parts