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A Little More Than An Acre?. Jim is buying a field from Rob…

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Presentation on theme: "A Little More Than An Acre?. Jim is buying a field from Rob…"— Presentation transcript:

1 A Little More Than An Acre?

2 Jim is buying a field from Rob…

3 Rob says the area of the field is…

4 … a little more than an acre.

5 Jim says to himself…

6 …I dont trust Rob!

7 How can I know the area for sure?

8 102 steps this way…

9 Keep walking…

10 Keep walking…

11 Keep walking…

12 Now diagonally… 112

13 Finally, I measure my own steps to be about 2.2 feet each…

14 Was Rob s t r e t c h i n g the truth? … a little more than an acre.

15 Use Herons formula, taking the top triangle first…

16 Use Herons formula, taking the top triangle first…

17 Now the bottom triangle…

18 Now the bottom triangle…

19 The sum of the areas is…

20 Now for some unit conversions. First, convert square paces to square feet…

21 Then square feet to square miles…

22 And, finally, square miles to acres…

23 The area of the field is…

24 Rob is a Liar! … a little more than an acre.


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