triangle

CoMaC discusses with us the trisection of angles and shows us its proof in a non-computational way.

CoMaC gives you a further look at the statement proved in the article on quadrilateral and triangles.

Find the proof, in the form of pictures, for a geometric statment on quadrilaterals and triangles.

 
English

Let your students arrive at the sum of a pentagon's internal angles themselves, by folding paper into a pentagon. 

Watch this simple video to see how it's done.

Here are some related resources on Teachers of India:

In mathematics, breaking up is not hard to do!

In my search for suitable projects which encompassed a wide spectrum of arithmetic, geometric and algebraic components with a focus on mensuration, I naturally turned to tangrams. This topic is a favourite for both teachers and project designers...writes Sneha Titus.

Observe a relationship, then prove it – satisfying in itself. Take this one step further and find the geometrical connect. Excitement squared!

Click on the following for the previous parts:

Architecture speaks of its time and place, but yearns for timelessness. Through this two part article, the writer dwells on a topic that closely links mathematics with art and culture.

“Hey mummy, look there. It is so beautiful!”
“Yes, my dear, it is indeed. It’s the epitome of Indian architecture. It has tessellations and many symmetrical patterns” 

We show in this note how, starting with the infinite harmonic sequence 1, 1/2, 1/3, 1/4, 1/5, 1/6, . . . , a natural process yields the well-known Pascal triangle and, further, a curious procedure yields back the harmonic sequence.
(‘Harmonic sequence’ is another name for the sequence of reciprocals of the positive integers.)

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