Parallelogram 33 Level 1 18 Apr 2024Weird shapes

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Noun: Parallelogram Pronunciation: /ˌparəˈlɛləɡram/

  1. a portmanteau word combining parallel and telegram. A message sent each week by the Parallel Project to bright young mathematicians.
  • Tackle each Parallelogram in one go. Don’t get distracted.
  • Finish by midnight on Sunday if your whole class is doing parallelograms.
  • Your score & answer sheet will appear immediately after you hit SUBMIT.
  • Don’t worry if you score less than 50%, because it means you will learn something new when you check the solutions.

1. The Klein Bottle

Watch this video where mathematical treasure, Cliff Stoll, shows us a very unusual shape. He actually stores hundreds of these shapes under his house!

(If you have problems watching the video, right click to open it in a new window)

1 mark

1.1 Who was the Klein bottle named after?

  • Felix Klein
  • Calvin Klein
  • Eine Kleine Nachtmusik
  • Albert Kleinstein
  • (Not answered)
1 mark

1.2 What spatial dimension does the Klein bottle exist in?

  • 2D
  • 3D
  • 4D
  • 5D
  • (Not answered)
2 marks

1.3 How many edges does a Klein bottle have?

  • None
  • 1
  • 4
  • Infinite
  • (Not answered)
2 marks

1.4 Two equally sized triangles have 6 edges in total.

If they are glued together to form a new shape how many edges would it have?

Correct Solution: 4

2. Some curious puzzles

2 marks

2.1 Think of a positive number, multiply it by 5, add 1, double what you have, take away 2, and divide by the number you first thought of.

What answer did you get?

  • 5
  • 10
  • 12
  • 15
  • can't tell
  • (Not answered)

Regardless of what number you thought of in to begin with, the answer will be 10.

Try it on your friends!

2 marks

2.2 How many regular hexagons are in this diagram?

  • 1
  • 4
  • 7
  • 8
  • 12
  • (Not answered)

Before you hit the SUBMIT button, here are some quick reminders:

  • You will receive your score immediately, and collect your reward points.
  • You might earn a new badge... if not, then maybe next week.
  • Make sure you go through the solution sheet – it is massively important.
  • A score of less than 50% is ok – it means you can learn lots from your mistakes.
  • The next Parallelogram is next week, at 3pm on Thursday.
  • Finally, if you missed any earlier Parallelograms, make sure you go back and complete them. You can still earn reward points and badges by completing missed Parallelograms.

Cheerio, Simon and Ayliean.