A proof that of rectangles that
have a given area, the square has the smallest perimeter.
A method for finding equations of lines
that pass through points, have certain slopes, or are either parallel or
perpendicular to other lines.
This one is really neat: Can you find an algorithm to tell whether a given
point is inside or outside of a given triangle? It's surprisingly hard to
do, but surprisingly simple once it's done.
Check it out!
Math League:
geometry
(Basic terms, Angles and angle terms, Figures and polygons, Area and
perimeter, Coordinates and similar figures, Space figures and basic solids)