C2 Flashcards
1
Q
Equation of a circle with centre (a,b)
A
(x-a)^2 + (y-b)^2 = r^2
2
Q
The angle between the tangent and the radius is
A
90°
3
Q
Tangents drawn down from a common point to a circle are equal in….
A
Length
4
Q
The centre of a circle is on the perpendicular bisect or of any…
A
Chord
5
Q
The angle subtended by a diameter at the circumference is
A
90°
6
Q
What is a geometric series?
A
A series in which each term is obtained from the previous term by multiplying by a constant called the common ratio, r
7
Q
Nth term of geometric series
A
ar^n-1
8
Q
Sn of geometric series
A
Sn = a(1-r^n) / 1-r
9
Q
Sine rule
A
a/sinA = b/sinB = c/sinC
Or
sinA/a = sinB/b = sinC/c
10
Q
Cosine rule
A
a^2 = b^2 + c^2 - 2bc cosA
11
Q
Area of triangle
A
1/2 absinC
12
Q
Equation of a circle with centre (0,0)
A
x^2 + y^2 = r^2
