Excerpted from the New York Times, Nov. 25, 2014

*The Lives of Alexander Grothendieck, a Mathematical Visionary*

“When we write “x2 + y2 = 1,” we wish into existence a perfect circle. 135 more words

Excerpted from the New York Times, Nov. 25, 2014

*The Lives of Alexander Grothendieck, a Mathematical Visionary*

“When we write “x2 + y2 = 1,” we wish into existence a perfect circle. 135 more words

We’ve been learning about the first Thanksgiving, Pilgrims, and the Wampanoags. During our read aloud time, we read the story **The Very First Thanksgiving Day ** 39 more words

CCSS-M.G-CO.C.9. Prove theorems about lines and angles. Theorems include: vertical angles are congruent; **when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent…** 771 more words

CCSS-M.**G-CO.C.9. **Prove theorems about lines and angles. Theorems include: **vertical angles are congruent**; when a transversal crosses parallel lines, alternate interior angles are congruent and corresponding angles are congruent; points on a perpendicular bisector of a line segment are exactly those equidistant from the segment’s endpoints. 460 more words

As we finished Unit 2 on Tools of Geometry this year, I looked back at Illustrative Mathematics to see if a new task had been posted that we might use on our “put it all together” day before the summative assessment. 662 more words

CCSS-M.** G-CO.B.8. **Explain how the criteria for triangle congruence (ASA, SAS, and SSS) follow from the definition of congruence in terms of rigid motions.

This standard made me realize that the textbooks I had used for a long time allowed the ASA, SAS, and SSS Triangle Congruence Theorems into our deductive system as postulates. 641 more words