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Fri. 11/01/13 GG.35 Parallel and intersecting lines UR Group: Henry, Alex, Isabel, & Richard

Fri. 11/01/13 GG.35 Parallel and intersecting lines UR Group: Henry, Alex, Isabel, & Richard. M<1 = (2x + 12)° M<2 = (3x + 18)° Henry: [wrote on a w/board] values that were given Isabel: [Sp]……. Richard: She said she want to try it. Isabel’s solution.

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Fri. 11/01/13 GG.35 Parallel and intersecting lines UR Group: Henry, Alex, Isabel, & Richard

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  1. Fri. 11/01/13GG.35 Parallel and intersecting linesUR Group: Henry, Alex, Isabel, & Richard

  2. M<1 = (2x + 12)° M<2 = (3x + 18)° Henry: [wrote on a w/board] values that were given Isabel: [Sp]……. Richard: She said she want to try it

  3. Isabel’s solution Henry: No, is not like that Isabel: [Sp……] Alex: she said, that was how she learned it in DR

  4. Henry: We need to know the relationship between the angles. They are both interior angles[look point to the text] they add up to 180°

  5. Henry: [wrote] m< 1 + m< 2 = 180° But: m<1 = 2x + 12 and m<2 = 3x + 18 2x + 12 + 3x + 18 = 180°

  6. m<1 = 2x + 12 m<2 = 3x + 18 (2x + 12) + (3x + 18) = 180° Henry: We have to combine like terms. Who will continue?

  7. Alex: 2x + 12 + 3x + 18 = 180° 2x + 3x + 12 + 18 = 180° 5x + 30 = 180° paused Henry: Let me finish it

  8. Richard: Is that the final answer? Henry: No, we put x into m<1 = (2x + 12) = (2 * 30 + 12) = (60 + 12) = 72° m<2 = (3x + 18) = (3 * 30 + 18) = (90 + 18) = 108°

  9. Take away • The group identified that interior angles on the same side of the transversal are supplementary (180°) The group followed the rules of the format by: Being responsive to the comment of their peers. Neither dominate conversation nor refrain from participation.

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