Key formulas Flashcards
1
Q
Area of a sector? In degrees
A
θ/360 x πr²
2
Q
Length of Arc? In degrees
A
θ/360 x πd
3
Q
Area of a sector? In radians
A
1/2r² θ
4
Q
Length of Arc? In radians
A
θr
5
Q
SA of Cylinder
A
2π r h + 2π r²
6
Q
Volume of Cylinder
A
πr²h
7
Q
SA of Cone
A
πr² + πrl
8
Q
Volume of Cone
A
πr²h/3
9
Q
Circumference of a semi circle?
A
πr + d
10
Q
km/h –> m/s
A
divide by 3.6
11
Q
Translations (c d)? What’s numerator and denominator
A
numerator –> moved left or right by how much
denominator –> moved up or down by how much
12
Q
How do positive logarithm graphs look like?
A
- Top left quadrant is not in the negative axis
13
Q
How to solve the “by considering bounds, find to a suitable degree of accuracy” questions
A
- Find upper and lower bound
- round it to 1 signifant figure
- then round to 2 significant figure
- then 3
- whichever one equals the lower and upper bound is the value for your answer
- Reason being that both bounds agree to _____ significant figures
14
Q
How to solve the “by considering bounds, find to a suitable degree of accuracy” questions
A
- Find upper and lower bound
- round it to 1 significant figure
- then round to 2 significant figure
- then 3
- whichever one equals the lower and upper bound is the value for your answer
- Reason being that both bounds agree to _____ significant figures
15
Q
æ^2 + B^2 is the same as what
A
(æ + B)^2 - 2æB
