GMAT Prep Minor Arc Geometry

BREAKING: Target Test Prep releases Brand New 2026 On Demand GMAT prep course

dnkcdnguy: Senior | Next Rank: 100 Posts; Posts: 56; Joined: Sat Sep 06, 2008 12:27 pm

by dnkcdnguy » Tue Feb 17, 2009 4:56 pm

Can someone please help with this question.

Thanks

Attachments

"If you fail to plan,..then you plan to fail"

Source: Beat The GMAT — Problem Solving | Tue Feb 17, 2009 4:56 pm

tini: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Sat Dec 29, 2007 1:37 am; Thanked: 2 times; Followed by:1 members

by tini » Tue Feb 17, 2009 5:21 pm

measure of arc op=2*35=70
measure of arc qr=2*35=70
measure of arc pq=180-(70+70)=40

pq is 40/360 of the circumference

1/9 * 2 pi*9=2pi

dnkcdnguy: Senior | Next Rank: 100 Posts; Posts: 56; Joined: Sat Sep 06, 2008 12:27 pm

by dnkcdnguy » Tue Feb 17, 2009 5:52 pm

Thanks Tini. I forgot to take away another 70 degrees.

The formula x/360 helps. Also, since the D = 18pi, 1/9 * 18/1 = 2pi

Thanks for your help

"If you fail to plan,..then you plan to fail"

valdemas: Newbie | Next Rank: 10 Posts; Posts: 5; Joined: Sat Jan 10, 2009 12:44 pm

by valdemas » Wed Feb 18, 2009 11:53 am

tini wrote:measure of arc op=2*35=70
measure of arc qr=2*35=70
measure of arc pq=180-(70+70)=40

pq is 40/360 of the circumference

1/9 * 2 pi*9=2pi

why is the measure of op= to 70 and not 35?

tini: Junior | Next Rank: 30 Posts; Posts: 27; Joined: Sat Dec 29, 2007 1:37 am; Thanked: 2 times; Followed by:1 members

by tini » Wed Feb 18, 2009 12:03 pm

because of tha property:
measure of the minor arc = twice the inscribed angle

kalyand022: Junior | Next Rank: 30 Posts; Posts: 28; Joined: Mon Nov 17, 2008 4:40 am

by kalyand022 » Thu Feb 19, 2009 7:24 pm

i m nt able to undersnt..can u pl elaborate the ans with explaination...

• Page 1 of 1