Thursday, November 18, 2010

Jayvee's Pythagoras Scribe Post

5.Martin measured a rectangle and wrote: Width: 9 cm Length: 22 cm Diagonal: 23.8 cm
Could these measurements form a rectangle? Justify your answer.


a²+b²=c²
22²+9²=c²
(22x22)+(9x9)=c²
484cm2+81cm 2=565
√565cm²≠ 566.44
This can't form a rectangle because a and b does not equal c.

7.What is the height of the wheelchair ramp? Give your answer to the nearest tenth of a centimetre.

a²=c²-b²
80²-79²=a²
6400-6241=159
159cm²=a²
√159cm=√a²
12.6cm²=a
The height of the wheelchair ramp is 12.6cm.

13.A cruise ship travels from Port Cassett north at a speed of 34 km/h for 2.5 h. Then it turns 90° and travels west at 30 km/h for 7.3 h. When it reaches Green Sea Island, how far is the ship from Port Cassett? Express your answer to the nearest kilometre.

a²+b²=c² 34x2.5=8.5
219²+8.5²=c² 30x7.3=219
(219x219)+(8.5x8.5)=c2
47961+72.25=48033.25
48033.25km=c²
√48033.25km=√c2
219.16km=c
The ship is 219.16km away from Port Cassett.

6 comments:

  1. Good job Jayvee!! Nice use of color, and nice pictures! great job.

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  2. Good Job Jayvee, your post is very understandable and neat. I like the pictures and the way you used different colors.

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  3. Good Job Jayvee, your blog post was remarkable. I liked how you used pictures and colour. It was neat and probably everyone can understand it. Good Job and keep up the good work.

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  4. Great Job jayvee, I liked how you used pictures & you explained why some of the triangles are not equal . Also , i liked the use of colors in your post. Keep up the great work!

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  5. Good Job Mr. Perfect! I liked the pictures a lot. The whole post was neat and easy to understand, and lastly I really liked how you made your answer a different color. KEEP UP THE GOOD WORK!

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  6. Good job, Jayvee !
    Your post was really neat. You didn't get anything wrong, from what I have. I like how your fonts are different, it makes it easier to read. Keep it up !

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