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  • click and drag to draw a triangle of about the size desired;
  • select the Format ▸ Position and sizemenu;
  • make sure Keep ratio is unchecked;
  • adjust:
    • the height so that it equals the width multiplied by 0.866,
    • the width so that it equals the height divided by 0.866,or
    • both, maintaining the proportion 0.866 between the height and the width;
  • If you change the size of the triangle, click Keep ratio to keep the length of the three sides equal.
  • Click OK.