## Tags » Geometry

#### The Surface Area of a Sphere

I’ve written before about making sense of the surface area of a sphere. The lesson this year unfolded (unpeeled?) a bit differently.

I’m not sure how students might guess that the surface area of a sphere has something to do with the area of a great circle of the sphere. 200 more words

#### End of 3rd Quarter

Hi everyone.

It’s the end of 3rd quarter, and we’ve got a grading day. Actually half-day. But, tbh, as my kids say, I got here 15 minutes late (f off, I biked 7 miles in the snow), met with my mentor, made a sweet playlist, did some grading, went out to lunch with my department, and now I’m back again to finish grading. 568 more words

#### Notice and Note: The Equation of a Circle

I wrote in detail last year about how our students practice I can look for and express regularity in repeated reasoning to make sense of the equation of a circle in the coordinate plane. 222 more words