このガイドは英語で提供されています。
The Trapezoid Area Calculator takes two parallel bases and the perpendicular height. It gives the area in the square of your chosen length unit, plus square metres and square feet. A labelled schematic identifies a, b and h; the drawing does not scale to the entered measurements.
Use it for a geometry problem or a flat region measured as a trapezoid. For triangles use the triangle calculator; for combined regions use square footage. A slanted side alone is not enough to determine height.
Both bases and height must be positive. Choose metres, centimetres, millimetres, feet or inches. Changing the unit converts valid dimensions to preserve their physical size. Enter plain decimals or scientific notation, without units, expressions or thousands separators.
Confirm that the two entered bases are parallel, then measure height perpendicular to them. Leaning the trapezoid left or right does not change its area when bases and height stay the same. If a diagram labels only a slanted side, determine perpendicular height separately before using this tool.
For example, 80 cm, 120 cm and 50 cm produce 5000 cm², or 0.5 m². This equals the result from 0.8 m, 1.2 m and 0.5 m. Entering centimetre values while metres are selected would multiply the area by ten thousand.
$$A=\frac{a+b}{2}h$$
高さは底辺に垂直です。斜辺の長さではありません。
はい。底辺が同じ長さでも同じ面積公式を使えます。
変わりません。有効な寸法を換算して実際の大きさを保ちます。
平行な二辺と垂直な高さを入力。