Difference between revisions of "1961 IMO Problems"

(Problem 1)
(Problem 2)
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===Problem 2===
 
===Problem 2===
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Let ''a'',''b'', and ''c'' be the lengths of a triangle whose area is ''S''.  Prove that
  
[[1961 IMO Problems/Problem 2 | Solution]]
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<math>a^2 + b^2 + c^2 \ge 4S\sqrt{3}</math>
  
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In what case does equality hold?
  
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[[1961 IMO Problems/Problem 2 | Solution]]
  
 
===Problem 3===
 
===Problem 3===

Revision as of 10:31, 12 October 2007

Day I

Problem 1

(Hungary) Solve the system of equations:

$\begin{matrix} \quad x + y + z \!\!\! &= a \; \, \\ x^2 +y^2+z^2 \!\!\! &=b^2 \\ \qquad \qquad xy \!\!\!  &= z^2 \end{matrix}$

where $a$ and $b$ are constants. Give the conditions that $a$ and $b$ must satisfy so that $x, y, z$ (the solutions of the system) are distinct positive numbers.

Solution

Problem 2

Let a,b, and c be the lengths of a triangle whose area is S. Prove that

$a^2 + b^2 + c^2 \ge 4S\sqrt{3}$

In what case does equality hold?

Solution

Problem 3

Solution


Day 2

Problem 4

Solution


Problem 5

Solution


Problem 6

Solution



See Also

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