关于本计算器
Areas, perimeters, volumes and surfaces of rectangles, circles, boxes and cylinders with live results.
几何计算器
图形的面积、周长、体积与表面积。
面积
20
周长18
常见问题
Circle formulas?
Area = πr², circumference = 2πr.
Box or cube?
Use the box with equal sides for cubes; surface = 2(lw+lh+wh).
Which units?
Keep one unit for all inputs; results are in square or cubic units.