How to Make a Hole in Postcard-sized Paper Big Enough to Pass Through

 

What	Time	Materials
Greet students. Today we'll explore one of the most pefect shapes in nature. Can you guess what	5 s
this may be? (Circle)
At the end of the lesson, students will be able to:
1. have a deeper appreciation of the area of a circles
2. problem solve creatively
3. think outside the box
1. to motivate students as to be 100% engaged
2. to elicit maximum participation involving the 3 senses (visual, auditory, touch)
1. Can everyone construct a circle with their 2 fingers? 3 fingers? 4 fingers? 5 fingers? 10 fingers?
2. Was making a good circle easy? Compared to say makng/drawing a sqaure or a rectangle? Why?
3. Compare the circles formed by someone with shorter fingers with a person with longer fingers.
What do you call the area inside the circle/hole?
1. Let's explore the biggest circle/hole we can make out of a piece of paper. Who has some idea of	7 m	whiteboard,
this is done? Show in the whiteboard.		markers
2. Discuss: areas of a unit circle vs . 2x2 circle vs. 3x3 circle.
3. Draw conclusions (The bigger the paper, the bigger the circle that can be cut in it.		10 postcard-size
4. Show a piece of postcard-size paper. What is the biggest circle/hole you can make out of it.		cardboard
Is the hole large enough to put your fist through? Your head through? For the whole length of you		with pre-drawn
pass through?		line
5. What if I tell you a secret that it is possible to cut a hole through this cardboard big enough for you		markings
to pass through? What woud the pattern of the cutting be like? (zigzag/irregular) Why?
6. Give each student a postcard with pre-drawn line markings. Ask them to describe the pattern		scissors
of dotted lines. Ask them to visualize the resulting hole this pattern will produce.
7. Give general instructions on how to cut the paper. Guide each student as they do the actual cuts.
8. End result: a huge hole big enough for a person to pass through.
1. How did you use the concept of area to cut a super-sized hole out of a small paper?	1 m
1. Summarize activity.	2 m