robsiew Posted September 8, 2015 Share Posted September 8, 2015 My 9th grade ds just started geometry. I'm wondering how strict I need to be on him when he measures angles. He sometimes is 1-2 degrees off. What do you all do for grading? Do you allow them to be a little off? With triangles I get that he can be very accurate, but what about measuring angles in general? Is it important that he is spot on? Quote Link to comment Share on other sites More sharing options...
Jann in TX Posted September 8, 2015 Share Posted September 8, 2015 Protractors are NEVER 100% accurate do to 'line thickness' errors. I always give 1-2 degrees of 'grace'. 2 Quote Link to comment Share on other sites More sharing options...
cbollin Posted September 8, 2015 Share Posted September 8, 2015 another "degrees of grace" grader here. Quote Link to comment Share on other sites More sharing options...
creekland Posted September 8, 2015 Share Posted September 8, 2015 Even in ps Geometry, we have a +/- 2 degree window for accuracy with measurements, so an angle of 34 degrees would be correct with anything from 32 - 36 degrees written down. If they are measuring a triangle or all the angles along a flat line, then all angles have to add up to 180. There's no grace in that sum. They have to adjust until they get it. 1 Quote Link to comment Share on other sites More sharing options...
regentrude Posted September 8, 2015 Share Posted September 8, 2015 slightly off topic: are high school students really graded on measuring angles with a protractor???? I would have thought this to be a 6th grade skill. 1 Quote Link to comment Share on other sites More sharing options...
creekland Posted September 8, 2015 Share Posted September 8, 2015 slightly off topic: are high school students really graded on measuring angles with a protractor???? I would have thought this to be a 6th grade skill. It's a small part of geometry - and should be a review of their skills. Occasionally it will also come into play when studying angle properties (like corresponding, complementary, supplementary, etc) and it can be part of a larger test question (word problem). It's hardly a grade changer TBH. Quote Link to comment Share on other sites More sharing options...
Jann in TX Posted September 8, 2015 Share Posted September 8, 2015 slightly off topic: are high school students really graded on measuring angles with a protractor???? I would have thought this to be a 6th grade skill. I do review this-- and there is ONE test question that requires measuring an angle... Out of a class of 20 homeschool students I will have 3-4 who have never used a protractor before. Not all homeschool elementary curriculums do pre-Geometry. 2 Quote Link to comment Share on other sites More sharing options...
robsiew Posted September 9, 2015 Author Share Posted September 9, 2015 Well, it's at the beginning of Jacob's geometry so that's why I ask. He is my oldest so I've never taught geometry before so I don't know how much he'll be asked to do, but it's been on his first few assignments. Thanks! I will give him grace.... you learn so much with your oldest! Poor kid, I am always apologizing to him! 2 Quote Link to comment Share on other sites More sharing options...
Mike in SA Posted September 10, 2015 Share Posted September 10, 2015 slightly off topic: are high school students really graded on measuring angles with a protractor???? I would have thought this to be a 6th grade skill. Ditto. It's just a skill to be applied... To echo earlier, being off by a bit is pretty irrelevant. You might want to check if they are using the correct "0" on the protractor. It isn't normally the edge of the instrument (but can be, especially on higher-end models). If you see a hole in the middle for a compass, then the zero normally runs through the hole. Quote Link to comment Share on other sites More sharing options...
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