`1.  The area of an isosceles trapezoid if you know sides and angle  `

-  lower base

-  upper base

-  equal lateral sides

- angle  at the lower base

Formula for calculating Area of a trapezoid if given all sides ( A ) :

Formulas for calculating Area of a trapezoid if given sides and angle ( A ) :

`2.  The area of an isosceles trapezoid in the case of a circle being inscribed in it  `

,      -  bases of an isosceles trapezoid

,       -  angles of an isosceles trapezoid

- radius  of the inscribed circle

- diameter  of the inscribed circle

- center  of the inscribed circle

Formulas  for calculating Area of a trapezoid if given radius, diameter or bases ( A ) :

For the circle inscribed into an isosceles trapezoid, the following is TRUE:

`3.  The area of an isosceles trapezoid in the case of a circle being inscribed in it and if you know middle line  `

,      -  bases of an isosceles trapezoid

-  equal lateral sides

- radius  of the inscribed circle

- center  of the inscribed circle

Formulas  for calculating Area of a trapezoid if given radius, sides or middle line ( A ) :

For the circle inscribed into an isosceles trapezoid, the following is TRUE:

`4.  The area of a isosceles trapezoid if you know diagonals and angle between them`

-  diagonal of a trapezoid

,  -  angles between the diagonals

Formula for calculating Area of a isosceles trapezoid if given diagonals and angle between them ( A ) :

`5.  The area of an isosceles trapezoid if you know lateral side, middle line and angle  `

-  equal lateral sides

- middle line

,  - angles at the bases

Formula for calculating Area of a trapezoid if given lateral side, middle line and angle ( A ) :

`6.  The area of an isosceles trapezoid if you know bases and height  `

,      -  bases of an isosceles trapezoid

- height  measured at right angles to the base

Formula for calculating Area of a trapezoid if given bases and height ( A ) :