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

,      -  bases

- midline

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

`2.  Sides (bases) of a right trapezoid if you know lateral sides, angle at the base and other base  `

,      -  bases

- lateral side = height

- lateral side

-  angle  at the base

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

`3.  Sides (bases) of a right trapezoid if you know diagonals, lateral side (height) and angle between the diagonals  `

,      -  bases

- lateral side = height

,      -  diagonals

,      -  angles between the diagonals

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

* It is true in this case:

`4.  Sides (bases) of a right trapezoid if you know area of a trapezoid, lateral side (height) and other base  `

,      -  bases

- lateral side = height

-  height

-  area

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

* It is true in this case: