HAHA!
i'm here to blog to relief stress.
STRESS FROM PLANE GEOMETRY WHICH CAN KILL!
& it killed me :(
here's my very good and nice and thoughtful tuition teacher, MR ONG, & his VERY detailed explanation! :D
here's an evidence ;)

isn't is CLEAR enough? HAHA, but it took me two hours to understand this freaking hard question, HOW GREAT.
i think i'm prepared to flunk the upcoming plane geometry test, SIGH. someone help me please!