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
- height
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 ) :
