Animate point go roundgoing around a triangle

How can I animate a point moving on trianglea triangle's sides?
I can generate trainglea triangle and point, but I have no idea how to define point movement. I'm guessing that I have to use sin$\sin$ and cos$\cos$ in coordinates, but I can't find a way to define the triangle in this way.
Can someone help me a bit with that?

enter image description here point on triangle

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occurred Jan 25, 2015 at 4:37

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edited Jan 24, 2015 at 18:18

Kuba

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asked Jan 24, 2015 at 18:05

Dcortez

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Animate point go round a triangle

How can I animate a point moving on triangle sides?
I can generate traingle and point but I have no idea how to define point movement. I'm guessing that I have to use sin and cos in coordinates but I can't find a way to define triangle in this way.
Can someone help me a bit with that?

enter image description here

animation

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