Iso (same) Skelos (leg, implies side) triangle has 2 equal sides (at least), and hence has 2 equal angles (at least).
An equilateral triangle (all 3 sides are equal in length, and all 3 angles are equal, which means 600 each in 3600, or PI/3 with 2PI = 360 degree ) is a special family (class) of isosceles.
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3 Isosceles triangle, Equilateral triangle, and Scalene triangle.
A triangle has three sides and therefore three vertices, or angles.
Decihedron has 10 sides.
A Hendecagon has 11 sides
to draw-pentagon :length pd seth 126 repeat 5 [ fd :length rt 72 ] end Draws a pentagon "length" pixels on each side, with the turtle originating and terminating at the apex.