1. GEOMETRY
Units and 13

3. Term Representation Name Dimensions POINT point A A LINE 1 r M N PLANE
point A A
LINE 1 r M N
PLANE D E 2
plane DEF F
Lines – any 2 points define a line.
Planes – any 3 non-collinear points define a plane.

4. Kind of angles:

8. Sexagesimal System (60) We use Sexagesimal System to measure
time (hour: h, minutes: min, seconds: s)
angles (degree: º, minutes: ‘ , seconds: ‘’ )
1 h = 60 min
1 º = 60 ‘
1 min = 60 s
1 ‘ = 60 ‘’
x 3600
x 60
x 60
Hour (h)
Degree (º)
Minute
(min) ( ‘ )
Second
(s) ( ‘’ )
: 60
: 60
: 3600

9. Exercise 1. Express in minutes:
a) 2h =
120 min
d) 300 ‘’ = 5`
b) 2h 3 min =
123 min
e) 540 s =
9 min
c) 3º 42’ =
= 222‘
c) 2 min 180 s =
2 + 3 = 5 min

11. 1’ = 60 ‘’ 1º = 60 ’ ADDING AND SUBTRACTING ANGLES
1’ = 60 ‘’
1º = 60 ’

15. Area and perimeter of plane shapes
We call AREA to the size of a surface.

16. We call PERIMETER of a plane shape to the SUM of the length of its sides

17. Calssification of quadrilaterals

29. Area of a triangle