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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…

9 102 86 Keep walking…

10 102 115 86 Keep walking…

11 102 115 81 86 Keep walking…

12 102 115 81 86 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.

15 102 115 81 86112 Use Herons formula, taking the top triangle first…

16 102 115 81 86112 Use Herons formula, taking the top triangle first…

17 102 115 81 86112 Now the bottom triangle…

18 102 115 81 86112 Now the bottom triangle…

19 102 115 81 86112 The sum of the areas is…

20 102 115 81 86112 Now for some unit conversions. First, convert square paces to square feet…

21 102 115 81 86112 Then square feet to square miles…

22 102 115 81 86112 And, finally, square miles to acres…

23 102 115 81 86112 The area of the field is…

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


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