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Mathematics 18 Online
OpenStudy (anonymous):

Are my answers correct?

OpenStudy (solomonzelman):

I am sure they are.....

OpenStudy (anonymous):

hahhaaha dont be silly @SolomonZelman

OpenStudy (solomonzelman):

I don't fully see the questions in the attachment.

OpenStudy (anonymous):

and.. E's #5 please

Directrix (directrix):

@stupidinmath Are we doing D or E?

OpenStudy (anonymous):

solomon: in d, it is said "Use circle P at the right to name the arcs intercepted by each angle" directrix: i'm doing both since its almost sleep time :|

Directrix (directrix):

In #5, what is the measure of arc BC?

OpenStudy (anonymous):

5? There's no #5..

Directrix (directrix):

E.4

OpenStudy (phi):

D4 looks dubious. If P is the center of the circle, you have a "central angle" = arc (not ½ the arc)

Directrix (directrix):

@stupidinmath Here's where I got #5 >>and.. E's #5 please :)

OpenStudy (anonymous):

Directrix; I can't figure it out.. Phi: oh.. yeah..

OpenStudy (anonymous):

oh, lol, sorry, typo

Directrix (directrix):

Look at this. How many degrees in a circle?

Directrix (directrix):

To get < BEC, you need this theorem:

OpenStudy (anonymous):

360..

Directrix (directrix):

So, m<CBE = 1/2 * (100 + 100) m < CBE = ?

OpenStudy (anonymous):

oh.. <CBE= 100

Directrix (directrix):

Yes. I get that it is time for you to sleep but you have wrong answers for E 1, 2, and 3. Do you want to correct them now or wait until tomorrow?

OpenStudy (anonymous):

Hmm, I'd like to do it now since tomorrow's the deadline :|

OpenStudy (phi):

For E, you want the average of the SUM of the intercepted arcs (you seem to be find the average of the difference)

Directrix (directrix):

@stupidinmath In each of those three problems with the wrong answers, you have made the same mistake.

OpenStudy (anonymous):

so, its supposed to be addition then divided by 2?

Directrix (directrix):

Half the sum of the arc the angle cuts off and the arc its vertical angle cuts off.

OpenStudy (phi):

yes, add up. divide by 2

Directrix (directrix):

On the first one, (50 + 80)/2 Did you see that Phi found your error pattern?

OpenStudy (anonymous):

oh, yeah.. i subtracted it.. thanks.. so.. 47.5 60 80

OpenStudy (phi):

notice this rule works even for a central angle: the two arcs will have identical measure, when you add them and divide by 2, you get the measure of 1 arc.

Directrix (directrix):

D.4 is not correct

OpenStudy (phi):

calculator did E1 incorrectly. Throw it out and get a new one.

Directrix (directrix):

47.5 @stupidinmath How did you get that?

OpenStudy (anonymous):

oh,65 .__. right

Directrix (directrix):

It came from here: (50 + 80)/2

Directrix (directrix):

65, yes. Now, one more to correct. Look at D.4.

OpenStudy (anonymous):

yeah.. confusing

Directrix (directrix):

D.4 follows the pattern of E 1,2,3.

OpenStudy (anonymous):

1/2(arc JK) is wrong?

Directrix (directrix):

Is is 50% wrong.

Directrix (directrix):

1/2 (arc JK + arc GH) Angle formed by two intersecting chords.

OpenStudy (anonymous):

oh.. forgot the other segment. got it :))

OpenStudy (anonymous):

thank you c:

Directrix (directrix):

Glad to help. Rest well.

OpenStudy (anonymous):

well, i ain't done yet hahaha i can do this *.*

Directrix (directrix):

Oh, I thought you said you said you had to sign off.

Directrix (directrix):

>>directrix: i'm doing both since its almost sleep time :|

OpenStudy (anonymous):

yeah, but I can't help but answer since points will be a waste :|

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