Archive for July 2016
Maths Olympiad – Practice 21
Posted July 21, 2016
on:Click to download the slide: MO_Practice21.ppsx
Maths – something important
Posted July 21, 2016
on:I personally think these are something fundamental one must master before they move on to Algebra.
Science – The 24 Solar Terms
Posted July 20, 2016
on:Still confused about Solstices, Equinox, Aphelion, Perihelion?
Hope this picture helps:
In questions involve 3 groups (3 circles in the diagram), it sometimes takes time to understand why
Total = A+B+C – A∩B – B∩C – A∩C + A∩B∩C
Putting up this slides in hope it helps in visualize how we reach the above.
Science – Space Science – Why the same side of the moon always faces the Earth
Posted July 18, 2016
on:This video is a bit too quiet, but very informative.
Science – Space Science – Albedo
Posted July 18, 2016
on:We come across this term “albedo” and I find the picture explains it very well:
Here is the definition:
Maths – Centroid theorem
Posted July 15, 2016
on:This is a brief and clear video explaining Centroid theorem and how to use it.
Maths – Alcuin’s Sequence
Posted July 14, 2016
on:“How many triangles with integral side lengths are possible, provided their perimeter is 3636 units?”
To solve the above problem, we can use the Alcuin’s sequence:
Now, let’s try another question:
How many possible triangles are there with perimeter of 12 and sides of integral length?
** integral length – the length is integer