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# Geometric Inequalities

Given 5 sticks of length 1, 3, 5, 9, and 10, how many distinct triangles can be formed? Learn the techniques and develop an intuition for working with geometric inequalities.

\[ \large S=\left| \sqrt { { x }^{ 2 }+4x+5 } -\sqrt { { x }^{ 2 }+2x+5 } \right| \quad \forall x \in \mathbb R\]

For \(S\) as given above, find the maximum value of \(S^8\).

**Notation:** \(| \cdot |\) denotes the absolute value function.

Positive reals \(x,y,z\ge \dfrac{\sqrt{3}}{3}\) satisfy the condition \(xyz+x+y-z=0\). If \(kxyz-xy-yz-zx\ge 1\) is always true, the the minimum value of \(k\) can be expressed as \(\dfrac{a\sqrt{b}}{c}\) for positive integers \(a,b,c\) with \(a,c\) coprime and \(b\) square-free.

What is \(a+b+c\)?

In the middle of the wall opposite to Brilli's, rests a sugar crystal, **1** foot below the ceiling. The minimum distance Brilli needs to cover to reach the sugar crystal, assuming that Brilli can walk anywhere inside the room, is \(x\). Determine the value of \( x^2\).

What is the smallest value (round off to 1 decimal point) that

\(\sqrt{\strut 49+a^2-7\sqrt2a}+\sqrt{\strut a^2+b^2-\sqrt2ab}+\sqrt{\strut50+b^2-10b}\)

can have for positive real numbers \(a\) and \(b\)?

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