Assertion: mica's edge | /r/AtLocation | the mark
Facets:
Source sentences:
text: When you can sight along the triangle with your eye so that the bottom horizontal edge is on the mark you made on the tree trunk at eye level and the hypotenuse lines up with the top of the tree you then simply add the height to the mark on the trunk, to the distance you are from the tree trunk – and that approximates to the height of the tree.