Solved Problems for Indian Statistical Institute (B. Math and B. Stat), Chennai Mathematical Institute, JEE Main & Advance ( IIT ) and for Olympiads ( RMO and INMO ). Get Solved problems for boards ( CBSE and ISC Mathematics Papers) along with board papers.
Monday, July 13, 2020
incentre of Orthic Triangle:
Interesting Property of a Trapezium
Prove that the
straight line that passes through the point of intersection of the diagonals of
a trapezium and through the point of intersection of its non-parallel sides,
bisects each of the parallel sides of the trapezium.
Saturday, June 27, 2020
Friday, June 26, 2020
Geometry: Problem involving orthocentre
ABC is a triangle with AB = 13; BC = 14 and CA = 15. AD and BE are the altitudes from A and B to BC and AC respectively. H is the point of intersection of AD and BE. Find the ratio HD/HB.
Solution:
Thursday, May 28, 2020
A Triangle With a 45 Degrees Angle in Square : A very hard problem from Geometry
Let
This in turn implies that
The same argument can be employed to show that
Now, since triangles
This therefore implies that
The problem, due to V. Proizvolov, appeared in Kvant - a popular Russian magazine - (#1, 2004, M1895), with a solution in a later issue (#4, 2004).