Posted by Olive on .
The faceoff areas in ice hockey have a diameter of 29.9 feet. Find the area of a faceoff circle. Use 3.1.4. for pi. Round to the nearest tenth if necessary.

geometry 
Steve,
a = 3.14 * 29.9^2 = ...

geometry 
Ms. Sue,
A = pi * r^2
A = 3.14 * 14.95^2 = 
geometry  MS Sue is right 
Steve,
ouch! Go with Ms Sue!
Always read problems carefully... 
geometry 
Ms. Sue,
Although I was an English and social studies teacher, occasionally I taught a section of 7th grade math. When I discovered that I was only about 95% accurate when demonstrating on the board, I was embarrassed. I told the class that if they discovered I had made a stupid mistake, I'd give anyone extra credit for politely calling it to my attention. Worked like a charm. <g>

geometry 
MathMate,
I was thinking of something along the same lines, but couldn't find a good way to put it in action. Thank you for sharing the bright idea.

geometry 
Ms. Sue,
You're welcome. :)

geometry 
Steve,
I recall my class in analytic geometry in high school. There was one guy named Andy who would read a comic or something during one of Mr. Jarmon's involved solutions. After two blackboards were filled with equations and things didn't come out right, Andy would look up and in a few seconds point out where the teacher had erred. He'd have been loaded up with extra credit in your class, Ms Sue! Of course, he naturally didn't need it.