Holton on problem solving-19: the ex-circle problem

摘要

Using some geometric software such as can be found onsome COT calculators construct the diagram in the originalproblem (Note 1). This software will enable your students tomeasure the radius of the ex-circle on the hypotenuse. Notonly that, but it will enable you to measure this radiusaccurately which the students would not be able to do if theyhad constructed the diagram using ruler and compasses.