A document explaining line and triangle geometry for all grade 9 students. There are notes on Pythagoras, Similarity and Congruency as well as Angle and Triangle analysis. These are predominantly notes and a new document with worked examples as well as questions and a memo so you can practice by yo...
Obtuse
•
angle 7
( bigger than 90° , less than 180°)
◦
Straight line n 180
reflex ( bigger
•
angle c than 180°, less than 360°)
• revolution 360
of ( all triangles
ypes triangle add up to 180°)
•
Equilateral
"
Sosceles
(all angles csides) (
are the
only 2 sides are the same
equal)
/
same /
equal )
•
Scalene
( all sides are different)
, classified
triangles by angle
Right -
angled
7
✓
cute
angled
7 (
Obtuse
angled triangle
theorem of
tythagoras
2 2 2
[ hypoteneus
always
A =
b + [ A opposite the
b
sides 900 angle
↓
this is
always )
,
sides
hypotenuse
the
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