1
Q
Volumes of similar objects
A
If the length scale factor is k, then the volume scale factor is k^3
2
Q
Volume of a pyramid
A
Area = 1/3 * base area * perpendicular height
3
Q
Volume of a cone
A
Area = 1/3 * πr^2 * h
4
Q
Surface area of cone
A
πr^2 + πrl
where l is the slant height
5
Q
Volume of sphere
A
4/3 πr^3
6
Q
Surface area of a sphere
A
4πr^2
7
Q
Areas of similar objects
A
If the length scale factor is k, then the area scale factor is k^2
8
Q
Interior angles of polygons
A
An n-sided polygon = (n-2) x 180°
9
Q
Exterior angles
A
The exterior angles of any polygon always add up to 360°
IGCSE Maths
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