Step
by step guide to construct a circle touching the http://www.geogebratube.org/material/show/id/4363 (Download GeoGebra file) How
to draw a circle in a triangle which touches its three sides?

Key Stage 3 (Junior Secondary) > 3.2 Measures, Shape & Space 度量、圖形與空間 > Simple Introduction to Deductive Geometry 演繹幾何簡介 >