I-SHIRLEY
At
Mark's fifth birthday party, a family affair in their tidy
split-level, Dennis produceda clean sheet of tracing paper
and announced, Pythagorean Theorem!" The skinny boy
grabbed a fat crayon and felt the eyes of his grandparents,
aunts, and uncles follow himn as he approached the dining
room table, drew a big triangle and underneath it wrote: a2
+ b2 = c2. "Good!" his father exclaimed, pushing his heavy
black glasses up the bridge of his nose, Now what's this?"
he asked, jabbing a finger at the long leg of the triangle. The
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