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Perimeter is the sum of the sides. An equilateral triangle has three sides of equal length. So the perimeter in this case would be 7.8mm x 3 = 23.4mm.

Q: What is the perimeter for a equilateral triangle with 7.8mm sides?

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This is going to be a bias-answer only because I have only ridden Sector 9 boards. But the best board to start riding would be a Sector 9 Original. Don't get into the Apex 37 or 34's because they are pintail and are a little trickier to start with and are meant for more professional riders. Not saying they are not a good choice because they are but I would say Sector 9 with basic setup. 78mm Wheels (Orangutang are best), Gullwing trucks and Red Swiss bearings. Also check for cutouts on the board which will allow you to turn sharper without wheel-bite. Hope this helps! (I'm a girl by the way!)