Pythagorean Theorem Without Words
Based on a problem in Exeter Math 2 A 5 x 5 square and a 3 × 3 square can be cut into pieces that will ﬁt together to form a third square. How does this prove the Pythagorean Theorem.
parabola, knot, line and conchoid from SHM and UCM
Problems with Angles 2
9.1.3 Pre #1103407 option B
Spreadsheet and Histogram
coplanar and point and lines