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  1. Let'sthink

    I Proof without words for Heron's formula

    I was thinking about a diagram (in the category of proof without words) for Hero's formula for area of a triangle with sides a, b, and c and given that 2s = a+b+c. A = √[(s(s-a)(s-b)(s-c)] I tried to develop one but could not. Can any body give or give me an hint to proceed.
  2. Let'sthink

    Cause of Greenhouse effect

    As I understand and I think correctly, that Green house effect is in essence conversion of lower wavelengths in the Sun's energy to higher wavelength near infrared regions which can heat up the medium more efficiently. So if we have a closed transparent box containing some amount of green house...