Math notes
Angles in a regular polygon
sum of all interior angles = In-2)x180 n= number of sides
sum of all exterior angles =
always 360
Each interior angle =
180 (n -2)
R
Each exterior angle = 360
n
Areas
Rectangle :
Lxw Geometry A
Triangle Exbxh : b) (a + b + c = 1800
parallelogram : bxh
Straight line
b, be 1888
Trapezium u
:
+ =
E >
2
Circle : Mr2
A
Quadrilateral
Sector :
1 x Mr b a+ b + c + d 360
=
368
6 C
Volumes
Cuboid Lxwxh 360
:
ab a+b + c =
Pyramid 1xbasexh
area
:
Sphere : 4
, Mr3
3
A a +b
1
cone C
:
X Mixh =
b) -
O
Isoceles
& S
c = b
b C
parallel angles
7 > >> >
A
al (a
a+ b = 188 > a=b
D
b
3 > a = b b)
Angles in a regular polygon
sum of all interior angles = In-2)x180 n= number of sides
sum of all exterior angles =
always 360
Each interior angle =
180 (n -2)
R
Each exterior angle = 360
n
Areas
Rectangle :
Lxw Geometry A
Triangle Exbxh : b) (a + b + c = 1800
parallelogram : bxh
Straight line
b, be 1888
Trapezium u
:
+ =
E >
2
Circle : Mr2
A
Quadrilateral
Sector :
1 x Mr b a+ b + c + d 360
=
368
6 C
Volumes
Cuboid Lxwxh 360
:
ab a+b + c =
Pyramid 1xbasexh
area
:
Sphere : 4
, Mr3
3
A a +b
1
cone C
:
X Mixh =
b) -
O
Isoceles
& S
c = b
b C
parallel angles
7 > >> >
A
al (a
a+ b = 188 > a=b
D
b
3 > a = b b)
