Revision Note

Centres of Triangle

Centroid of triangle

Property: The three medians intersec

Math

Chords

Perpendicular line from the centre to chord bisects chord.

Math

Circle

For a circle with radius $r$.

Circumference $=2\pi r$
Area o

Math

Circular Cylinder

For a circular cylinder with base radius $r$ and height $h$.… Read

Math

Combinations

For $n$ different objects, if we select $r$ objects out of th… Read

Data Handling

Complementary Events

Let $E$ and $F$ be two events. If $E$ and $F$ are complementar… Read

Data Handling

Condition for Isosceles Triangle

Condition: $a=b$

Reference: sides opp. eq. $\angle$s… Read

Math

Condition for Right-angled Triangle

Condition: $a^2+b^2=c^2$

Result: The triangle is a right-… Read

Math

Conditional Probability

Let $E$ and $F$ be two events.
\begin{equation*}
P(F|E)=\f… Read

Data Handling

Conditions for Congruent Triangles

Three corresponding sides equal

Condition: $AB=PQ$, $BC=

Math

Conditions for Parallel Lines

Corresponding angles equal

Condition: $a=b$

Reference: c

Lines and Angles

Conditions for Parallelogram

Two pairs of opposite sides equal.

Reference: opp. sides eq

Math

Conditions for Similar Triangles

Three corresponding angles equal

Condition: $\angle A=\a

Math

Cone

For a cone with base radius $r$, height $h$ and slant height $… Read

Math

Coordinates of the Centroid

For a triangle with vertexes $A(x_1,y_1)$, $B(x_2,y_2)$ a… Read

Coordinates

Cosine Law

\begin{equation*}
a^2=b^2+c^2-2bc\cos A
\end{equation… Read

Math

Cyclic Quadrilateral

A pair of opposite angles of cyclic quadrilateral are suppl

Math

Direct Variation

If $y \propto x$ (i.e. $y$ varies directly as $x$), then we ha… Read

Math

Discriminant

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

Math

Distance Formula

For two points $A(x_1,y_1)$ and $B(x_2,y_2)$, the distanc… Read

Coordinates