Area of a Trapezium Calculator
⬛ Area & perimeter (2D). Use the Area of a trapezium formula to find area, parallel side a, parallel side b, height: pick the value you want, type the others, and the answer updates as you go.
Pick the ○ next to the value you want to find, fill in the others, and it solves as you type.
What each letter means
| Quantity | Unit |
|---|---|
| Area | cm² |
| Parallel side a | cm |
| Parallel side b | cm |
| Height | cm |
Worked example
Find the area when Parallel side a = 4 cm, Parallel side b = 8 cm, Height = 5 cm.
Using A = 1/2(a + b)h: Area = 30 cm².
Frequently asked questions
What is the formula for Area of a trapezium?
A = 1/2(a + b)h.
What do the letters stand for, and what units are used?
Area in cm², Parallel side a in cm, Parallel side b in cm, Height in cm.
How do you calculate area?
Put the values into A = 1/2(a + b)h. For example, with Parallel side a = 4 cm, Parallel side b = 8 cm, Height = 5 cm, area = 30 cm².
Can I solve for a different value?
Yes. In the calculator above, pick the circle next to any value (area, parallel side a, parallel side b, height) and fill in the others: it rearranges the formula for you.
