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 ( 
) :

