Mathematics 4024 · O Level · Vector geometry

Vector geometry — practice question

$ABCDE$ is a pentagon. $AFB$, $AHE$ and $BGC$ lie on straight lines. $F$ lies halfway along $AB$. $H$ lies halfway along $AE$. $G$ divides $BC$ in the ratio $1:2$. $\overrightarrow{AH}=a$, $\overrightarrow{AF}=a-b$, $\overrightarrow{BG}=\overrightarrow{ED}=c$.
(a(i))[1]

Find $\overrightarrow{FH}$ from the information given.

(a(ii))[2]

Using vectors, show that $GD$ is parallel to $FH$ using the given relationships.

(a(iii)(a))[2]

It is given that $c = \frac{4}{5}a + \frac{1}{5}b$. Express $\overrightarrow{DC}$ in terms of $a$ and $b$.

(a(iii)(b))[1]

Find the ratio $|\overrightarrow{AF}| : |\overrightarrow{DC}|$.

(b(i)(a))[2]

The transformation $T$ sends triangle $ABC$ onto triangle $A'B'C'$. Describe fully the transformation $T$.

(b(i)(b))[2]

The matrix $M$ represents $T$. Find the matrix $M$.

(b(ii))[1]

Triangle $A'B'C'$ is carried to triangle $A''B''C''$ by a reflection in the $y$-axis. Draw and label triangle $A''B''C''$.

(b(iii))[1]

Triangle $ABC$ is mapped to triangle $A''B''C''$ by an anticlockwise rotation about the origin. State the angle of rotation.

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