Maths Formulas And Useful Facts, Topic By Topic Flashcards
1
Q
Formula for Un of an arithmetic sequence?
A
Un= a + (n-1)d
2
Q
Formula for the sum of an arithmetic sequence?
A
Sn = n/2 [2a + (n-1)d]
3
Q
Angle at the center of a circle?
A
The angle at the center of a circle is twice the angle at the circumference subtended by the same arc.
4
Q
Angles in the same segment?
A
Angles in the same segment of a circle are equal.
5
Q
Cyclic Quadrilateral?
A
Opposite angles in a cyclic quadrilateral sum to 180
6
Q
Tangent and Radius?
A
A tangent to a circle is perpendicular to the radius at the point of contact.
7
Q
Angle Subtended by a Diameter?
A
An angle subtended by a diameter at the circumference is a right angle.
