In 55-60, find each sum. 3 32 33 311 -+ - + - + ... + -9 9 9 9

Math 112b Chapter 9 Section 2 02/22/2016 Upcoming: a) Quiz #3 on Wednesday February 24, 2016 b) Comp Quiz #2 on Monday February 29, 2016 c) Test #2 on Wednesday March 2, 2016 1. Describe how you would help students discover the sum of measures of the 3 angles in a triangle. - Measure the angles and add them up (need to know how to use a tool) - Cut, tear the corners of the triangle, stack and see which one is larger ; make another shape, in this case a line. - Rule: a straight line = 180 degrees 2. What must students know before completing number 1 - How to use the tool (protractor)