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Geometry
Jill Robertson
a
b
a
c
Angles in a triangle up to 180°
a
b
b
d
c
Angles in a quadrilateral up to 360°
e
c
Angles on a straight line
add up to 180°
d
a
.c
b
Angles round a point
add up to 360°
Isosceles triangles
have two sides the same
and two angles the same
b a
a
b
Where any two straight lines cross,
the opposite angles will be equal
In any Polygon, the sum of
the exterior angles is 360°
The sum of the interior
angles is (n – 2) x 180°
(n is the number of sides)
These angles
add up to 1800
They have various names
•Supplementary angles
which just means they
add up to 1800
•Allied angles
•Angles in the
trapezium
CIG = 1100
B
300
BCI = 800
I
700
A
800
D
C
1100
700
1000
H
G
E
F
1100
K
Calculate AIG
BIC
IBC
CFE
FGK
J