1. Unit 4- BASIC ELEMENTS in BI-DIMENSIONAL GEOMETRY
Brief glossary of the main concepts.

2. TOOLS
RULER is used to measure sizes (the LENGTH expressed in centimetres and millimetres.
SET SQUARE: 60º set square and º set square
(REMEMBER:
Angle Sum of a Triangle:
The angles in any triangle
Always add up
to degrees. )
Basic (pencil) COMPASS or COMFORT COMPASS with/without extension bar
PROTRACTOR 180 degrees (not compulsory)
HARD PENCILS: 2H or 3H
HB is intermediate.

3. glossary WORKSHEET LENGHT DEGREES ANGLES 1º= 60` 1`=60`` Angles:
RIGHT-ACUTE-OBTUSE
OUTLINE
SHAPE (FACE)- EDGE-VERTEX

4. Elements nomenclature
Point A, B, C, D, E..
Line _____ r, s, t, v….
Segment AB, CD, EF
(straight line on the top)
CIRCUMFERENCE
Arch- AB, CD, EF,… with a curve line on the top of the letters
Angles always are called by Greek small letters a,b,g.d.m,t..
CIRCLE