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3 votes
5 answers
325 views

What are some Geometry books with problems harder than McDougal Littell's "Geometry"?

0 votes
4 answers
797 views

How to teach Shapes?

4 votes
3 answers
972 views

How does one call two triangles that are image by a rotation one each other?

4 votes
7 answers
2k views

How to teach high school students to analyze diagrams in a proof?

5 votes
6 answers
1k views

Why do standard geometry textbooks not start with trigonometry?

1 vote
1 answer
166 views

Should I let go of some of the things I planned to learn, or should I take it as a challenge to try to accomplish all of the things I planned to do?

10 votes
6 answers
4k views

What is the simplest formula for calculating the circumference of a circle?

31 votes
13 answers
9k views

How to give my students a straightedge instead of a ruler

16 votes
5 answers
1k views

When Euclid was used as a textbook, what exercises did students do?

8 votes
5 answers
2k views

Models for spherical geometry

14 votes
4 answers
2k views

What is currently called geometry in high school?

16 votes
7 answers
935 views

Can we explain to undergraduates how points make a line?

6 votes
7 answers
560 views

Can we define length and perpendicularity not via an inner product?

12 votes
5 answers
3k views

How to justify formula for area of triangle (or parallelogram)

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