# RectangleSum Command

From GeoGebra Manual

- RectangleSum( <Function>, <Start x-Value>, <End x-Value>, <Number of Rectangles>, <Position for rectangle start> )
- Calculates between the
*Start x-Value*and the*End x-Value*the sum of rectangles with left height starting at a fraction*d*(0 ≤*d*≤ 1) of each interval, using*n*rectangles. - When
*d*= 0 it is equivalent to the LeftSum command, and when*d*= 1 it computes the right sum of the given function. -
**Note:**

- This command draws the rectangles of the left sum as well.
- This command is designed as a visual aid so won't give accurate answers if the number of rectangles is too large.
- See also the commands: UpperSum, LowerSum, LeftSum , TrapezoidalSum.

- This command draws the rectangles of the left sum as well.