sine rule !

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marmar29: Senior | Next Rank: 100 Posts; Posts: 61; Joined: Mon Feb 14, 2011 11:39 pm

by marmar29 » Fri Apr 22, 2011 9:56 pm

wht is the sine of 45 if u knw tht the opposite side =1 n its right -angled traingle

a) 1
b)1/2
c)1/square root 2
d)square root 2

please show me how u reach the answer!

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Source: Beat The GMAT — Quantitative Reasoning | Fri Apr 22, 2011 9:56 pm

vineeshp: Legendary Member; Posts: 965; Joined: Thu Jan 28, 2010 12:52 amFollowed by: 34 members; Thanked: 156 times; GMAT Score:720

by vineeshp » Sat Apr 23, 2011 1:32 am

Trigonometry is outside the scope of GMAT.

Vineesh,
Just telling you what I know and think. I am not the expert.

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VivianKerr: GMAT Instructor; Posts: 1035; Joined: Fri Dec 17, 2010 11:13 amFollowed by: 365 members; Location: Los Angeles, CA; Thanked: 474 times

by VivianKerr » Sat Apr 23, 2011 11:19 am

Vineeshp is correct. Luckily, you won't see any Trig on the GMAT.

This question is asking you about a 45-45-90 triangle. The ratio of the sides in a 45-45-90 is x: x: x*sq.rt of 2.

The question says that n = 1, so the sides of this triangle will be 1, 1, and sq. root of 2.

Sine = Opposite/Hypotenuse

Sin 45 = 1 / sq. root of 2

Again, this is totally outside of the GMAT scope, but if you need to review more Trig, I recommend Purple Math's explanations: https://www.purplemath.com/modules/basirati.htm

Vivian Kerr
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