Trigonometry question 9?

[xdecay]

I got D because I thought that VCAA might try to trick the students who got 178 and forgot to add 100 at the end so I guessed that 278 was the correct answer but then I realized if it was similar triangles it wouldn't make much sense. I think there was no logic at the reason behind my chosen answer (and this post isn't making much sense), but yes, I chose D.

[Ematuro]

I got D because I thought that VCAA might try to trick the students who got 178 and forgot to add 100 at the end so I guessed that 278 was the correct answer but then I realized if it was similar triangles it wouldn't make much sense. I think there was no logic at the reason behind my chosen answer (and this post isn't making much sense), but yes, I chose D.

LOL. Exactly what I thought but I added the 100 to 278 and got E.

[iliketurtles]

I chose A.
And I seem to be the only person in the state to do so.
FML.

[davidle_10]

D is the correct answer. because ABD is similar to ABC. That means if you worked out the triangle ABC to be 378 then the triangle CBD must have been 278 which cannot be determined.

[arock]

D is the correct answer. because ABD is similar to ABC. That means if you worked out the triangle ABC to be 378 then the triangle CBD must have been 278 which cannot be determined.

ACB is similar to ABD rather

[Bigkev93]

this question is just fked up :S it doesnt make sense, meh.
I hope exam 2 is better.

[Wezanator123]

For Geo and trig Q8. what did people put ? My friend told me it was C) (apparently)

[MJRomeo81]

I'm actually surprised I got this one right. The working out was relatively simple for a Q9 in a module...nevertheless I still only scored 5/9 for trig

[odessa]

9 for trig - is D - we got it checked by a spec teacher

[nerdgasm]

I think the answer to Question 9 is D, (my working is shown in the attached document, using similar triangles and Heron's formula).

In general, if two triangles are similar, the ratio of their side lengths is the square root of the ratio of their areas.

Hence, since the sides of Triangle ABC are 5/3 of the sides of Triangle ABD, it follows that the area of Triangle ABC is 25/9 of the area of Triangle ABD, and hence, the area of Triangle ABC is
100(25/9) = 277.777, closest to answer D.