How to pronounce 對角 in Cantonese (2 out of 3):

可以淨係對角咁畫,例如淨係畫左上角同右下角
You can only paint in rectangles, like just paint in the upper left and lower right corners.

Cantonese Sentence Breakdown

可以 ho2 ji5
(adjective) so so
淨係 zing6 hai6
only; merely
對角 deoi3 gok2
diagonal
gam3
so (Cantonese)
Mandarin equivalent: 这样zhèyàng [这样], like this
waak6
to delimit
to transfer
to assign
to plan
to draw (a line, a picture)
stroke of a Chinese character
to paint
to sketch
to delineate
to divide
to set aside
to put one's signature
例如 lai6 jyu4
for example
左上角 zo2 soeng6 gok3
upper left corner
tung4
and
右下角 jau6 haa6 gok3
bottom right corner