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Rotating Triangle

What happens to the perimeter of triangle ABC as the two smaller circles change size and roll around inside the bigger circle?

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Pericut

Two semicircle sit on the diameter of a semicircle centre O of twice their radius. Lines through O divide the perimeter into two parts. What can you say about the lengths of these two parts?

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Tri-split

A point P is selected anywhere inside an equilateral triangle. What can you say about the sum of the perpendicular distances from P to the sides of the triangle? Can you prove your conjecture?

Curvy Areas

Stage: 4 Challenge Level: Challenge Level:1
Suppose the radius of the smallest semicircle is $x$.
What are the radii of the other semicircles?
What areas can you work out, in terms of $x$ and $\pi$?