Geometry

M. Harvey - the book

UPDATE: I have more or less finished the first three parts now and the last part is well underway.
Do they meet? by Kristy Hawkins

Triangle Proofs

Geom Lessons/Demos

Geometry Application

Cardoid - Example of a Track in C.a.R.

GeoGebra

www.wdeptford.k12.nj.us/high_school/kyeager/geometry docs/Chapter 05/5.5 practice_a.pdf

{*style:<b> Writing Indirect Proofs

Indirect Proof. How to write indirect proofs that employ proof by contradiction: for triangles, segments, perpendicular lines

Indirect proof is synonymous with proof by contradiction. A keyword signalling that you should consider indirect proof is the word 'not'.

Indirect Proofs

On a sphere, the sum of the angles of a triangle is not equal to 180°. A sphere is not a Euclidean space, but locally the laws of the Euclidean geometry are good approximations. In a small triangle on the face of the earth, the sum of the angles is very nearly 180.

Geometry

T he word geometry is Greek for geos - meaning earth and metron - meaning measure. Geometry was extremely important to ancient societies and was used for surveying, astronomy, navigation, and building. Geometry, as we know it is actually known as Euclidean geometry which was written well over 2000 years ago in Ancient Greece by Euclid, Pythagoras, Thales, Plato and Aristotle just to mention a few.