`1.  Side (base) of an isosceles trapezoid if you know other base and midline of a trapezoid  `

,      -  bases

- midline

Calculate the base of an isosceles trapezoid if given middle line and other base  ( a b  ) :

`2.  All four sides of an isosceles trapezoid if you know height, angle at the base and other sides  `

- smaller base

- larger base

-  leg

-  angle  at the base

- height

Calculate the lateral side (leg) of a trapezoid if given angle at the base, height or bases  ( c  ) :

Calculate the base of a trapezoid if given angle at the base, height and other base  ( a b  ) :

Calculate the base of a trapezoid if given angle at the base, lateral side (leg) and other base  ( a b  ) :

`3.  Bases of an isosceles trapezoid if you know height, diagonals and angle between the diagonals  `

- smaller base

- larger base

-  leg

-  diagonal

,      -  angles between the diagonals

- height

Calculate the side (base) of a trapezoid if given diagonal, lateral side (leg) and other base ( a b  ) :

Calculate the lateral side (leg) of a trapezoid if given diagonal and bases ( c  ) :

Calculate the side (base) of a trapezoid if given diagonal, height, angle between the diagonals and base ( a b  ) :

* It is true in this case:

`4.  Sides of an isosceles trapezoid if you know area of a trapezoid  `

,      -  bases

-  leg

-  midline

,      -  angles at the base

- height

- area

Calculate the side (base) of a trapezoid if given area of a trapezoid ( a b  ) :

Calculate the lateral side (leg) of a trapezoid if given area of a trapezoid ( c  ) :

* It is true in this case: