Gilbertson, Nicholas J.  <br/><br/>
Broken Ceiling Lights  : Circular Area Without the Radius (Journal Article) 

 - Reston, Virginia   : National Council of Teachers of Mathematics  , 2023 
 - 874–878p. 
 - Mathematics Teacher: Learning Teaching PK12   , Volume 116: Issue 11, November 2023 .
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<br/><br/> Abstract: A customer walks in to a lighting store with a broken ceiling light, and the solution to finding a replacement glass illuminates an alternative approach to finding the circumference and area of a circle without knowing the circle’s center, radius, or diameter. 
<br/><br/><label>ISSN: </label>0025-5769 
<br/><br/><label>Subjects--Topical Terms: </label><br/>Reasoning/Sense Making/Proof| Mathematical Practices| Attend to precision| Professional Development / Teacher Training| Math Content Courses