...by four straight lines. 23. Multilateral Figures, or Polygons, by more than four straight lines. 24. Of three.sided figures, an Equilateral Triangle is that which has three equal sides. 25. An Isosceles Triangle is that which has only two sides equai. 26. A Scalene Triangle is that which...
Of three-sided figures, an equilateral triangle is that which has three equal sides. 
