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The Nine-Point Center
X(5) in Kimberling's Encyclopedia of Triangle Centers, is the center of the nine-point circle, which is the unique circle passing through the midpoints of the sides of the triangle. The radius of the nine-point circle is one-half the circumradius.
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2010
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January
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- Speak With Conviction
- What Teachers Make
- Formative Assessing to the Extreme
- Median Grading (Part 2)
- What if I used the Median to Calculate the Grade?
- Euclid and his Modern Rivals
- 100 Visitors
- More of My Mental Rube Goldberg Machine
- My Mental Rube Goldberg Machine
- Too Much Time on Your Hands?
- Interesting Fraction Division
- Things That Make Me Go "Hmmm..."
- Fermat Point
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