1. Side (base) of an isosceles trapezoid if you know other base and midline of a trapezoid
,
- bases
- midline
2. All four sides of an isosceles trapezoid if you know height, angle at the base and other sides
- smaller base
- larger base
- leg
- angle at the base
- height
3. Bases of an isosceles trapezoid if you know height, diagonals and angle between the diagonals
- smaller base
- larger base
- leg
- diagonal
,
- angles between the diagonals
- height
* It is true in this case:
4. Sides of an isosceles trapezoid if you know area of a trapezoid
,
- bases
- leg
- midline
,
- angles at the base
- height
- area
* It is true in this case:
1. Lateral side (height) of a right trapezoid if you know bases, other lateral side and angle at the base Â
 ,
   -  bases
   - lateral side = height
 - lateral side
  -  angle
    -  height
Â
Â
Â
2. Lateral side (height) of a right trapezoid if you know diagonals, bases and angle between the diagonals Â
 ,
    -  bases
   - lateral side = height
 ,
    -  diagonals
 ,
    -  angles between the diagonals
Â
* It is true in this case:
Â
Â
3. Lateral side (height) of a right trapezoid if you know bases or midline and area of a trapezoid Â
Â
 ,
    -  bases
   - lateral side = height
 - midline
    -  area of a trapezoid
Â
Â
Â
4. Lateral side of a right trapezoid if you know bases, other lateral side (height) and angle at the base Â
 - larger base
 - smaller base
   - lateral side = height
 - lateral side
  -  angle at the base
    -  height
Â
Â
Â
5. Lateral side of a right trapezoid if you know area of a trapezoid, angle at the base and bases or midline Â
 ,
    -  bases
   - lateral side (leg)
  -  angle at the base
 - midline
    -  area
Â
Â
Â
,
- bases
=
- lateral side = height
,
- diagonals
Other formulas for diagonals as for a scalene trapezoid
1. Median of a right trapezoid (also known as midline or midsegment) if you know bases
,
- bases
- midline
2. Median of a right trapezoid (also known as midline or midsegment), if you know base, lateral sides and angles at the base
- larger base
- smaller base
- lateral side
=
- lateral side = height
- angle at the base
- midline
3. Median of a right trapezoid (also known as midline or midsegment), if you know diagonals, height and angle between the diagonals
,
- diagonals
,
- angles between the diagonals
- height
- midline
4. Median of an arbitrary trapezoid (also known as midline or midsegment), if you know height and area of a trapezoid
- areaof a trapezoid
- height
- midline