1. Diagonals of a trapezoid if you know sides and angles at the base
, 
- bases
, 
- legs
, 
- angles at the base
, 
- diagonals
Find the diagonal of a trapezoid using the law of cosines ( ) :
) :
Find the diagonal of a trapezoid if given all four sides ( ) :
) :
2. Diagonals of a trapezoid using height
, - bases
, - legs
, - angles at the base
, - diagonals
- height
Find the diagonal of a trapezoid using height, angles at the base and sides ( ) :
) :
3. Diagonals of a trapezoid if you know other diagonal, angle between the diagonals and height or area or midsegment
, - bases
, - diagonals
, - angles between the diagonals
- height
- midsegment
- areaof a trapezoid
Find the diagonal of a trapezoid if given other diagonal, angle between the diagonals and height or area or midsegment
( ) :
) :
* It is true in this case:
4. Diagonals of a trapezoid using formula for the sum of the squared diagonals
- lower base
- upper base
, - legs
, - diagonals
Formula for the sum of the squared diagonals :
Find the diagonal of a trapezoid using formula for the sum of the squared diagonals ( ) :
) :
