Trapezoid Calculator

Your details

Isosceles: legs are equal. Right: one leg is perpendicular to the bases.
Choose what inputs you already know, and the calculator will derive the rest.
One of the two parallel sides. Usually the longer one.
cm
The other parallel side, opposite base a.
cm
Perpendicular distance between the two parallel bases, NOT the leg length.
cm
Left non-parallel side. Optional for area; required for perimeter.
cm
Right non-parallel side. Optional for area; required for perimeter.
cm
Area
40cm²
Perimeter26.78cm
Median (midsegment)8cm
Height5cm
Leg c5.39cm
Leg d5.39cm
Angle A68.07deg
Angle B111.93deg
Angle C111.93deg
Angle D68.07deg
Diagonal p9.423cm
Diagonal q9.423cm

This trapezoid has an area of 40 cm².

  • The midsegment (median) is 8 cm, equal to the average of the two parallel bases. Area equals the median times the height: 8 x 5 = 40 cm².
  • The legs account for 10.78 cm of the 26.78 cm perimeter; the bases alone are 16 cm.
  • The two diagonals measure 9.42 cm and 9.42 cm. In an isosceles trapezoid both diagonals are equal; here they are.
  • The two base angles are 68.1° (left) and 68.1° (right). Each pair of co-interior angles on the same leg sums to exactly 180°.

Next stepTo find the height from a known area, switch the solve mode to "Reverse: find height from area + bases".

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