Paint and fill the Cylinder
From Karnataka Open Educational Resources
Exploratory activity with paint to understand volume and surface area is approached.
Understand surface area of a cylinder
Understand volume of a cylinder
Prerequisites/Instructions, prior preparations, if any
- Students are asked to cut paper into rectangular shape of any length (l) and breadth(b).
- Students are asked to cut paper into two congruent circles of circumference=length of rectangle(l)
- Students are asked to make a cylinder using rectangle and two congruent circles.
- Students are asked to use Red paint for painting single side of rectangle and circles and green for filling cylinder
- What is cylinder?
- Area of cylinder
- volume of cylinder
Materials/ Resources needed
- instrument box
- Hard paper
- gum tape
- paints-green and red
Process (How to do the activity)
- Students are grouped (each group has 4 students). They are asked to calculate the area of rectangle painted and area of circles painted.
- Students are asked to find out the quantity of green paint used to fill the cylinder.
- Developmental Questions:
- which shape the rectangular paper takes when rolled?
- What is the circumference of the circle?
- What is the relation between length of rectangle and circumference of the circle?
- what is the area of rectangle?
- what is the area of circle?
- How much curved surface area of the cylinder is painted?
- How much area of the cylinder is painted?
- How much green paint is required to fill the cylinder?
- Question Corner
- List out the cylindrical objects that you come across in your surroundings and calculate their areas
- compare them with their respective rectangle and circle.