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How big is my Screen?

Discover the patterns and use Pythagoras' theorem to determine the size of mobile phone screens. Match the number cards, find Pythagorean triples, and explore the measurements of different screens.

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How big is my Screen?

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  1. How big is my Screen?

  2. Objectives • To investigate patterns in numbers • To know how to find the size of a mobile phone screen • Find the sizes of different screens using Pythagoras’ Theorem.

  3. Activation • Match the cards with the other that is exactly the same • In your pairs decide what these numbers are called and suggest what keywords could you think of • Look for a connection between them.

  4. Pythagorean Triples • Are whole numbers • Eg 3, 4 and 5 are a PT since 9 + 16 = 25 • Can you find any others? • For homework see if you can find others.

  5. How big is my screen? What measurement on the television is used? Right angled Triangle Hypotenuse

  6. Where is the hypotenuse?

  7. Pythagoras’ Theorem Hypotenuse c a b a2 + b2 = c2

  8. How big is my Ipad? 7 inches 6 inches

  9. How big are the screens 14 inches wide 48 inches long 2 inches long 2.5 inches wide

  10. What have we learnt today?

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