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secondary 4 | A Maths
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Christmas MT
Christmas MT

secondary 4 chevron_right A Maths chevron_right Singapore

Hey can sb help w ii)? Cnt seem to get it. Tyty.

Date Posted: 5 years ago
Views: 294

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snell
Snell's answer
333 answers (A Helpful Person)
1st
corrected :)
snell
Snell
5 years ago
u:
Lol by the way for that same qns (I) second part, I got 200/sin(90-theta)

mathematically, ur ans 200/sin(90-θ) is correct.
bcos 90-θ and θ are complementary angles,
200/sin(90-θ) becomes
200/cosθ
which is the same as mine.
but like my ans, u din catch the "hence" in part (i),
so ur ans is different from the ans sheet (which shld be the correct one.)

hope this ans ur qns. :)
snell
Snell
5 years ago
note:
BC + CD = BD = 1200
so CD = 1200 - BC = 1200 - 800tanθ
which is in the ans sheet.
snell
Snell
5 years ago
u:
Hello, thank you for helping, but for part (i) the second qns, I noticed the ans was CD=1200-800tan(theta),

the ans for CD=1200-800tan(theta), shld be correct, bcos i din catch the "hence" in the qn.
bcos of "hence" , CD shld be derived from BC.
whereas, i start from ΔCDE afresh.
Christmas MT
Christmas MT
5 years ago
Ohh okay now I understand the significance of the hence, thank you for replying so late! Have a good night.
snell
Snell
5 years ago
dun forget to upvote!
Christmas MT
Christmas MT
5 years ago
Ofc
snell
Snell
5 years ago
thank you for ur upvote! :)
Christmas MT
Christmas MT
5 years ago
Js curious but what’s the point of upvotes?