Area of a rectangle with calculator. Definition and formula - Math Open Reference
The number of square units it takes to completely fill a rectangle.
Formula: Width × Height
Try this Drag the orange dots to move and resize the rectangle. As the size of the rectangle changes, the area is recalculated.
Area formula
The area of a rectangle is given by multiplying the width times the height. As a formula: wherew is the width
h is the height
Calculator
| ENTER THE TWO SIDE LENGTHS | ||
| Side 1 | clear | |
| Side 2 | clear | |
| Area: | ||
| Perimeter: | ||
| Diagonal: | ||
Use the calculator above to calculate the properties of a rectangle.
Enter the two side lengths and the rest will be calculated. For example, enter the two side lengths. The area, perimeter and diagonal lengths will be found.
Try this
- In the figure above, click on "hide details"
- Drag the orange dots on the vertices to make a random-size rectangle.
- Now try to estimate the area of the rectangle just looking at the squares inside it
Other polygon topics
General
- Polygon general definition
- Quadrilateral
- Regular polygon
- Irregular polygon
- Convex polygons
- Concave polygons
- Polygon diagonals
- Polygon triangles
- Apothem of a regular polygon
- Polygon center
- Radius of a regular polygon
- Incircle of a regular polygon
- Incenter of a regular polygon
- Circumcircle of a polygon
- Parallelogram inscribed in a quadrilateral
Types of polygon
- Square
- Diagonals of a square
- Rectangle
- Diagonals of a rectangle
- Golden rectangle
- Parallelogram
- Rhombus
- Trapezoid
- Trapezoid median
- Kite
- Inscribed (cyclic) quadrilateral
Area of various polygon types
- Regular polygon area
- Irregular polygon area
- Rhombus area
- Kite area
- Rectangle area
- Area of a square
- Trapezoid area
- Parallelogram area
Perimeter of various polygon types
- Perimeter of a polygon (regular and irregular)
- Perimeter of a triangle
- Perimeter of a rectangle
- Perimeter of a square
- Perimeter of a parallelogram
- Perimeter of a rhombus
- Perimeter of a trapezoid
- Perimeter of a kite
Angles associated with polygons
- Exterior angles of a polygon
- Interior angles of a polygon
- Relationship of interior/exterior angles
- Polygon central angle
Named polygons
- Tetragon, 4 sides
- Pentagon, 5 sides
- Hexagon, 6 sides
- Heptagon, 7 sides
- Octagon, 8 sides
- Nonagon Enneagon, 9 sides
- Decagon, 10 sides
- Undecagon, 11 sides
- Dodecagon, 12 sides
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