Area Calculator
Calculate the area of common geometric shapes: triangle, circle, rectangle, square, trapezoid, parallelogram, rhombus, and ellipse. Choose a unit and see the formula.
Formula: A = a × b
How to Use the Area Calculator
- Enter the required dimensions (length, width, radius, height, etc.).
- The area, volume, or other geometric value is computed instantly.
- Review the result along with the formula used.
- Adjust dimensions to compare different scenarios.
使用例
- •Calculating dimensions for home improvement or DIY projects.
- •Solving geometry problems for school or professional exams.
- •Estimating material quantities needed for construction work.
- •Planning layouts and designs with precise measurements.
計算式
Triangle: A = ½bh. Circle: A = πr². Rectangle: A = ab. Square: A = a². Trapezoid: A = ½(a+b)h. Parallelogram: A = bh. Rhombus: A = ½d₁d₂. Ellipse: A = πab.
よくある質問
How do I calculate the area of a triangle?
Multiply the base by the height and divide by 2: A = ½ × base × height. The height must be perpendicular to the chosen base.
What is the area of a circle?
A = π × r², where r is the radius. For example, a circle with radius 5 has area π × 25 ≈ 78.54 square units.
What is the difference between a rhombus and a parallelogram?
A rhombus has all four sides equal in length, while a parallelogram only requires opposite sides to be equal. A rhombus is a special case of a parallelogram.
How do I choose the right unit for area?
Use the same unit as your measurements, squared. If you measure in centimeters, the area is in cm². Common choices: mm², cm², m², km² for metric; in², ft² for imperial.