(a(i))[2]
Find the value of $x$. State a geometrical reason for your answer.
(a(ii))[2]
Find the value of $y$. State a geometrical reason for your answer.
(a(iii))[2]
Determine the value of $z$.
(b(i))[1]
Write down the mathematical name of line $XY$.
(b(ii))[1]
Write down the mathematical name of line $SR$.
(b(iii))[1]
Toby thinks shape $RST$ is a right-angled triangle. Give a geometrical reason why Toby is wrong.