Quadrilateral with inscribed circle (tangent construction)
This construction shows a quadrilateral with an inscribed circle.
In this construction the points of tangency with the circle (P, Q, R, S) can be
moved to change the quadrilateral.
What are some properties of such a quadrilateral?
The spreadsheet shows some lengths. To show other lengths you can input them into the spreadsheet. For example, if you want distance BQ, type BQ into a spreadsheet cell. If you want a label, put it in quotes. For example, type "BQ =" into a cell.