Compute trapezoid area from the two bases a, b and height h using A = (a+b)h/2.
由上下底与高求梯形面积。
| Item | Formula / Note | Source / Standard |
|---|---|---|
| Trapezoid area | A = (a + b)h/2 | Euclidean geometry |
| Midsegment | m = (a + b)/2 | Midsegment theorem |
| Triangle case | Reduces to bh/2 when a = 0 | Degenerate case |
| Ancient China | Nine Chapters field mensuration | Nine Chapters |
| Units | Squared length units | Dimensional rules |
| Earthwork | Road cross-sections use it | Earthwork calculation |