Some of the harder/hardest questions at Mathcounts can be tackled at ease using mass point geometry
so spend some time understanding it.
Mass Point Geometry : This one is easier to understand with questions that have detailed solutions.
Mass Point Geometry : another link for basics
This year's Mathcounts handbook Mass Point Geometry Stretch
from page 39 to page 40
(Talking about motivation, yes, there are students already almost finish
this year's Mathcounts' handbook harder problems.)
From Wikipedia
From AoPS
Mass Point Geometry by Tom Rike
Mass Points by Kevin An
Videos on Mass Point :
Basics
Mass Point Geometry Part I
Mass Point Geometry : Split Masses Part II
Mass Point Geometry : Part III
so spend some time understanding it.
Mass Point Geometry : This one is easier to understand with questions that have detailed solutions.
Mass Point Geometry : another link for basics
This year's Mathcounts handbook Mass Point Geometry Stretch
from page 39 to page 40
(Talking about motivation, yes, there are students already almost finish
this year's Mathcounts' handbook harder problems.)
From Wikipedia
From AoPS
Mass Point Geometry by Tom Rike
Mass Points by Kevin An
Videos on Mass Point :
Basics
Mass Point Geometry Part I
Mass Point Geometry : Split Masses Part II
Mass Point Geometry : Part III