Interesting Earth, Sun and Moon ខែមីនា 31, 2009Posted by psvjupiter in គណិតវិទ្យា.
Tags: លំហ, អក្សរសាស្រ្ត
(A B C is the intersection point of external tangent line of the each pair of circles)
ចូរអ្នកបង្ហាញថាA ,B, C រត់ត្រង់គ្នា។
Simply prove that A, B , C is collinear.
Hint 1 : It is just a geometry problem that applied Menelaus theorem. Menelaus theorem is what? Check wiki.
Hint 2: You may choose the triangle to apply menelaus to be the center of each three circle.