circle theorems and surface areas Flashcards
(11 cards)
1
Q
Explain circle theorems
A
- Angles at center is double angle at circumference
- Angles in semicircle is 90 degrees
- Opposite angles in a cyclic quadrilateral are 180 degrees
- Angles in same segment are equal
2
Q
Volume of a cylinder
A
πr²h
3
Q
volume of a cone
A
1/3πr²h
4
Q
volume of a sphere
A
4/3πr3
5
Q
circumference of sphere
A
πd
6
Q
surface area of sphere
A
4πr²
7
Q
curved surface area of cone
A
πrl
8
Q
surface area of cylinder
A
2πrh+2πr2
9
Q
circumference of circle
A
2πr
10
Q
area of trapezium
A
1/2 (a +b) h
11
Q
surface area of a cone
A
πr squared + πrl
