วันพฤหัสบดีที่ 21 กุมภาพันธ์ พ.ศ. 2556


Surface area of polygon


Surface area of polygon
example
regular polygon = (1/2) n sin(360°/n) S2
when n = # of sides and S = length from center to a corner

Find the surface area of a rectangular prism with length=0.2 m, width=40cm and height=0.8m.

1.     find the surface area of this picture and show the formula





















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2.    find the surface area of this picture and show the formula

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3.   find the surface area of this picture and show the formula



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4.    find the surface area of this picture and show the formula


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5.    find the surface area of this picture and show the formula


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6. Find the surface area of a rectangular prism with length=0.2 m, width=40cm and height=0.8m. <surface area=LWH>
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  7. Find the surface area of cone with radius=12cm. and slat height=20cm. <surface area=pi (R S) + pi (Rpower2)>
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8. Find the surface area of sphere with radius=2.5 inches
<Surface area=4(pi) x (Rpower2)>
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9. Find the surface area of hemisphere with diameter=32cm.
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10.Find Surface Area of Square Pyramid with a square base = 12m; Height of slant faces = 7 m

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วันพุธที่ 23 มกราคม พ.ศ. 2556

                                    
Tangrams are kind of like the ancient Chinese version of the modern card game solitaire. It tests your mind, you can play it alone and there is more than one way to win. You can test you wits with this simple puzzle by playing several unique tangram games such as double squares, tangoes, block puzzles and the big square. You can also create your own tangram shapes and name your own games if you're creative enough. Take a crack at it and see what figures you can create and how far you can push your imagination

วันพฤหัสบดีที่ 10 มกราคม พ.ศ. 2556

                                           Slope Graph


How can you verify the slope of a line just by looking at its graph? Think rise over run. Slope is a ratio between the change in y and the change in x. In fact, slope is written in the following format:



y= 1/2x + 2
                                                                        y= 1/2x + 2
                                                                      Jennifer Ledwith

วันศุกร์ที่ 21 ธันวาคม พ.ศ. 2555


Fibonacci number

Here is an illustration:

The ratios originate from the series: 1, 2, 3, 5, 8, 13, 21, 34, 55, 89, 144…

The golden ratio 1·618034 is likewise called the golden section or the golden mean.