Later in the same unit, your students are now using protract…

Lаter in the sаme unit, yоur students аre nоw using prоtractors to measure angles.  While students are working, you notice four different ways your students are measuring angles as shown below.  Select the student strategy(ies) that are valid ways of using a protractor to measure this angle. Way 1 For this strategy, the student lines up one of the rays of the angle with the 0 marking on the inner circle and 180 marking on the outer circle along the bottom right side of the protractor and concludes that the angle is 133 degrees since the other ray hits the 133 degree mark in the inner circle. Way 2 For this strategy, the student lines up one of the rays of the angle with the 0 marking on the inner circle and 180 marking on the outer circle along the bottom right side of the protractor and concludes that the angle is 47 degrees since the other ray hits the 47 degree mark on the outer circle. Way 3 For this strategy, the student lines up one of the rays with the marking of 100 in the inner circle and 80 degrees on the outer circle and concludes that this angle is 100 degrees since that ray falls on that marking. Way 4 For this strategy, the student lines the one ray up with the marking of 30 degrees along the top arc (and 150 degrees on the inner arc) and reads where the other ray hits the outer arc to be 163 degrees.  Since there is span of 163 - 30 degrees between the two rays, the measure of the angle is 133 degrees.