Assertion: triangle's number | /r/HasProperty | counted with multiplicity
Facets:
Source sentences:
text: The number (counted with multiplicity) of points on the edge of the remaining shape and points on the edges of the right angled triangles is equal to the sum of the number of points on the edge of the rectangle, of twice the points (counted without multiplicity) newly on an edge, and of twice the number of right angled triangles (to reflect the effect of multiple counting of the verices on the diagonals of the right angled triangles).
text: The number of points inside the the remaining shape and inside the right angled triangles is equal to the number of points inside the rectangle less the number (counted without multiplicity) newly on an edge.