Day 5

Do you know how to make squares using tangrams?
What are the different ways that you can make a square?
These are some of the "squares" that I have made during class.

 

I used 4 pieces of tangrams to make a square.

 

Dr Yeap challenged us to make a bigger square using the seven pieces of tangrams that he has given us. This is what I came out with..........

 

 

 



Do you have any other ways to make a square using the seven pieces of tangrams?

 

 

Do you know how many types of triangles are there?

 

 

 

 

The sum of angles in a right angle triangle is 180 degree and this is how I prove it.......

 

 

I folded in the two sides to form a right angle and therefore, the sum of the triangle is 180 degree.

 

What about other triangles that are not a right-angle triangle?

 

I tried another method...........

 

 

 

Do you have any other ways to find out the sum of angles in a triangle?

 

There are some of the websites that you can gain more insights:

http://www.freemathhelp.com/feliz-angles-triangle.html

http://www.mathsisfun.com/proof180deg.html

http://www.khanacademy.org/math/geometry/parallel-and-perpendicular-lines/triang_prop_tut/v/proof---sum-of-measures-of-angles-in-a-triangle-are-180

http://www.mathsteacher.com.au/year7/ch09_polygons/02_anglesum/sum.htm