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From Karnataka Open Educational Resources
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===Estimated Time===
===Estimated Time===
30 minutes
=== Prerequisites/Instructions, prior preparations, if any ===
=== 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
prerequisite knowledge
#What is cylinder?
#Area of cylinder
#volume of cylinder
===Materials/ Resources needed===
===Materials/ Resources needed===
#instrument box
#Hard paper
#gum tape
#paints-green and red
#brush
===Process (How to do the activity)===
===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.
What kinds of questions you can ask for that activity
*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?
*Evaluation
#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.
