Paint and fill the Cylinder

Exploratory activity with paint to understand volume and surface area is approached.

Objectives
Understand surface area of a cylinder

Understand volume of a cylinder

Estimated Time
30 minutes

Prerequisites/Instructions, prior preparations, if any
prerequisite knowledge
 * 1) Students are asked to cut paper into rectangular shape of any length (l) and breadth(b).
 * 2) Students are asked to cut paper into two congruent circles of circumference=length of rectangle(l)
 * 3) Students are asked to make a cylinder using rectangle and two congruent circles.
 * 4) Students are asked to use Red paint for painting single side of rectangle and circles and green for filling cylinder
 * 1) What is cylinder?
 * 2) Area of cylinder
 * 3) volume of cylinder

Materials/ Resources needed

 * 1) instrument box
 * 2) Hard paper
 * 3) gum tape
 * 4) paints-green and red
 * 5) brush

Process (How to do the activity)

 * 1) Students are grouped (each group has 4 students). They are asked to calculate the area of rectangle painted and area of circles painted.
 * 2) Students are asked to find out the quantity of green paint used to fill the cylinder.
 * Developmental Questions:
 * 1) which shape the rectangular paper takes when rolled?
 * 2) What is the circumference of the circle?
 * 3) What is the relation between length of rectangle and circumference of the circle?
 * 4) what is the area of rectangle?
 * 5) what is the area of circle?
 * Evaluation
 * 1) How much curved surface area of the cylinder is painted?
 * 2) How much area of the cylinder is painted?
 * 3) How much green paint is required to fill the cylinder?
 * Question Corner
 * 1) List out the cylindrical objects that you come across in your surroundings and calculate their areas
 * 2) compare them with their respective rectangle and circle.