Jump to content
Urch Forums

silentgrass

Members
  • Posts

    24
  • Joined

Converted

  • My Tests
    No

silentgrass's Achievements

Newbie

Newbie (1/14)

1

Reputation

  1. Now that you got the equation: 1/2 kBC * k AQ/ 1/2 BC*AQ = S/2S, why not just follow it and eliminate the factor 1/2 BC*AQ both of the numerator and the denominator on its left side and similarly S, the assumed area of AMN, on the right side, then you could naturally arrived at K^2=1/2, leading to the ans k=1/2sqrt. 1/2 kBC * k AQ/ 1/2 BC*AQ =1/2 k*k* (BC*AQ) / 1/2 (BC*AQ) =S/2S=1/2 I am still confused, and wonder how you could generate the expression s*k/2s from an equation? Note that it was indeed an equation rather than an expression from which you can only alter it, at best, to a different but simpler form of another equation proned to be solved, regardless of whatever steps you might have taken to transform it; consequently, I guess you might have missed something either on the left side or on the right one, or perhaps carelessly overlooked the equals sign or misconfused it with other signs such as the division sign on the left side.
  2. Sorry, I didn't know it was beyond the GRE's scope initially. I just unreasonably recalled that formula immediately I saw the pic in which I found the two triangles share one angle of the same degree that might help calculate the area of the two in that there are two sin A that can be eliminated by division without effort. Yet still we can otherwise try another formula S=1/2 a*h as a much simpler substitute. See my attachment below and I hope it helps. as for "hence MA^2/AB^2 = Area(AMN)/Area(ABC)", it was a theorem that be proved in the same way. Area(AMN)=1/2 MN*AP Area(ABC)=1/2 BC* AQ cuz MN/BC=AP/AQ=MA/AB (property of similar triangles) Area(AMN)=1/2 MA*MA (1) Area(ABC)=1/2 AB*AB (2) (1)/(2), we get MA^2/AB^2 = Area(AMN)/Area(ABC)
  3. Annie, the first one: B-BOY G-GIRL (g1g2g3g4)-a group of 4 girls supposed to sit together First we consider 4 girls supposed to sit together as a group represented by (g1g2g3g4). Apart from said 4 girls, there are 4 boys waiting outside. We can simply consider those 4 plus the only group of girls; all 8 students can be arranged like, for instance, [b1 (g1g2g3g4) B2 B3 B 4], of which B1, (g1g2g3g4), B2, B3, B 4 are regarded as 5 distinctive elements. The permutation for all 5 elements is A(5,5); permutation in the group (g1g2g3g4) is A(4,4). Thus the product A(5,5)*A(4,4) implies the overall permutation. The total permutation for all 8 people to be arranged randomly is A(8,8), and thus we can simply get the ans: A(5,5)*A(4,4)/A(8,8)=1/14 the second one: let MA/AB=k, similarly AN/AC=k, and we get MA=kAB, AN=kAC using S=1/2 ab sin A, we get 1/2 AM*AN*sin A=s (1) 1/2 AB*AC*sin A=2s (2) let (1)/(2) then [k(AB)*K(AC)]/(AB*AC)=1/2 hence k^2=1/2, k=1/sqrt(2) silentgrass.
  4. The ----of mass literacy coincided with the first industrial revolution; in turn, the new expansion in literacy, as well as cheaper printing, helped to nurture the----of popular literature. (A) building.. mistrust (B) reappearance.. display © receipt.. source (D) selection.. influence (E) emergence.. rise (ans) what's the meaning of "mass literacy" ,thanks
  5. 141."most people recognize the benefits of individuality, but the fact is that personal economic success requires conformity." whats the meaning of "personal economic success?" can anybody give me some examples with some aspects related to economic success? thanks ahead of time.
  6. 85. "Government funding of the arts threatens the integrity of the arts." the reddened phrase "integrity of arts" in the above issue seems rather confusing, so what's the exact meaning? thanks
  7. 14. STRIATED: GROOVE:: (A) adorned: detail (B) woven: texture © engraved: curve (D) constructed: design (E) braided: strand the supposed ans is E. what's the bridge, thanks
  8. 49. "Imaginative works such as novels, plays, films, fairy tales, and legends present a more accurate and meaningful picture of human experience than do factual accounts. Because the creators of fiction shape and focus reality rather than report on it literally, their creations have a more lasting significance." what does "factual accounts" mean? thanks
  9. Good job, very accurate interpretation. Now I understand it! thank you very much, classicist22:)
  10. Great! I've been looking for this kind of materials for a million years
  11. W:If you are planning to take the train when you leave next Friday, remember that I drive right past the station on my way home from campus. M:Say, I think I'll take you up on that. Q1:why did the man say "Say", what's the meaning? Q2:what does the idiom "take sb up on sth" mean? thanks.
  12. what about "the only largest..."?
  13. thank you very much, wasleys! You did help me alot, and I got it! That makes perfect sense.
×
×
  • Create New...