Basic Proportionality Theorem
Thomas E. Cooper
This is a proof of the basic proportionality theorem.
This outlines the proof of the following: If line DE intersects AB at D abd BC at E with DE parallel to AC, then BD/DA = BE/EC.
Pythagorean Theorem_Pierfrancesco Rapisardi(IT)
Exploring polygons formed by midpoints of sides of 3, 4, 6-gon
Triangle Congruency Tests
Normal Curve with slider
Задание 1.2.27 а)
Menelaus Theorem (Proof)