The approximately calculated area of a Semicircle

Topic:
Area
Task1: The area of a semicircle can be calculated approximately through a sum of rectangle areas under the curve of the semicircle. This sum of areas is called Lowersum. Check the checkbox “Lowersum = “! You see an approximated value for the area of the semicircle for 10 rectangles! Compare the given value with the area of the semicircle!
Task2: The same is possible for an Uppersum. Then the area of a semicircle is calculated approximately through a sum of rectangle areas above the curve of the semicircle. Check the checkbox “Uppersum = “! You see an approximated value for the area of the semicircle for 10 rectangles! Compare the given value with the Lowersum and the area of the semicircle!