Revision Note

Tangents to a Circle

If $PQ$ is a tangent to the circle at $T$, then $OT$ is perpend

Math

The Sum and the Product of the Roots

For quadratic equation $ax^2+bx+c=0$, where $a$, $b$ and $… Read

Math

Theoretical Probability

Let $E$ be an event.
\begin{equation*}
P(E)=\frac{\mbox{… Read

Data Handling

Transformations of Data

Let $\{x_1,~x_2,~\ldots,~x_n\}$ be a set of data. Let $\ov… Read

Data Handling

Translations of $y=f(x)$

For the function $y=f(x + h) + k$.

If $h$ is positive, then the

Math

Trapeziums

Definition: A quadrilateral with one pair of parallel side

Math

Triangle Inequality

Result: $AB+BCAC$, $AB+ACBC$ and $BC+ACAB$

Reference: tr… Read

Math

Triangle Numbers

The sequence of numbers $1$, $3$, $6$, $10$, $15$, $21$, $28… Read

Math

Trigonometric Functions for an Acute Angle

$\sin\theta = \dfrac{b}{c}$
$\cos\theta = \dfrac{a}{c}$

Math

Trigonometric Functions for any Angles

$r=\sqrt{x^2+y^2}$
$\sin\theta = \dfrac{y}{r}$
$\cos\t

Math

Trigonometric Identities

$\sin^2\theta+\cos^2\theta =1$
$\tan\theta=\dfrac{\s

Math

Trigonometric Ratios of Special Angles

$$\begin{array}{c|c|c|c|c|c}
& 0^\circ & 30^… Read

Math

Vertex Form of Quadratic Function

For quadratic function $y=ax^2+bx+c$, where $a$, $b$ and $… Read

Math

Vertically Opposite Angles

Result: $a=b$

Reference: vert. opp. $\angle$s… Read

Lines and Angles