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Mathematics 12 Online
OpenStudy (anonymous):

To the nearest tenth, what is MN? 24.2 27.0 48.4 54

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (anonymous):

@dan815

OpenStudy (anonymous):

Please please help

jimthompson5910 (jim_thompson5910):

looking at it now

jimthompson5910 (jim_thompson5910):

how long is KL

OpenStudy (anonymous):

How long is KL?

OpenStudy (anonymous):

@jim_thompson5910

jimthompson5910 (jim_thompson5910):

yes, I'm asking you that

jimthompson5910 (jim_thompson5910):

the straight line distance from point K to point L

OpenStudy (anonymous):

90?

jimthompson5910 (jim_thompson5910):

no

jimthompson5910 (jim_thompson5910):

the length starting from K and ending at L

OpenStudy (anonymous):

12?

jimthompson5910 (jim_thompson5910):

close, but no

jimthompson5910 (jim_thompson5910):

you're missing a piece

OpenStudy (anonymous):

K all the way to L.

OpenStudy (anonymous):

15?

OpenStudy (anonymous):

@jim_thompson5910

OpenStudy (anonymous):

No.

OpenStudy (anonymous):

Please help because i really do not know

jimthompson5910 (jim_thompson5910):

you add up those two numbers to get the total distance from K to L

jimthompson5910 (jim_thompson5910):

you're only going halfway (so to speak)

OpenStudy (anonymous):

27

jimthompson5910 (jim_thompson5910):

yes, KL = 27

jimthompson5910 (jim_thompson5910):

that is the radius of the circle since K is at the center and L is on the circle edge

jimthompson5910 (jim_thompson5910):

what other segment is a radius of this circle?

OpenStudy (anonymous):

MN?

jimthompson5910 (jim_thompson5910):

MN is a chord because its endpoints are on the circle

jimthompson5910 (jim_thompson5910):

A radius is some segment that goes from the center to the edge of the circle.

OpenStudy (anonymous):

KM?

jimthompson5910 (jim_thompson5910):

yes, KM is a radius

jimthompson5910 (jim_thompson5910):

all radii of the same circle are congruent (by definition of a circle is) so KM = KL KM = 27

jimthompson5910 (jim_thompson5910):

so we have this triangle |dw:1417912104428:dw|

OpenStudy (anonymous):

Very nice way of thinking Jim, that honestly took me a while of staring at the diagram to figure that out.

jimthompson5910 (jim_thompson5910):

P is the point at the intersection of KL and MN. They didn't label this point but should have.

OpenStudy (anonymous):

Thank You so much 27 is the correct answer

jimthompson5910 (jim_thompson5910):

no

OpenStudy (anonymous):

no LOL

jimthompson5910 (jim_thompson5910):

you need to find MP and then double it to get MN

OpenStudy (anonymous):

You're not even a third done the question yet,

OpenStudy (anonymous):

is the answer 54?

OpenStudy (anonymous):

You have to learn in multiple choice questions, some answers are put there on a mathematical strategic point to fool you.

jimthompson5910 (jim_thompson5910):

|dw:1417912284062:dw|

OpenStudy (anonymous):

do i subtract 12 from 27?

OpenStudy (anonymous):

Close.

OpenStudy (anonymous):

You substract 12^2 from 27^2 which would be equivalent to x^2.

OpenStudy (anonymous):

144 from 279?

OpenStudy (anonymous):

The ^ sign means to the power of.

OpenStudy (anonymous):

144 from 729

OpenStudy (anonymous):

585

OpenStudy (anonymous):

Alright now your equation looks like this: x^2 = 585.

OpenStudy (anonymous):

How do you think you can solve X?

OpenStudy (anonymous):

By dividing it by 2?

OpenStudy (anonymous):

No, the opposite of an exposant is a square root.

OpenStudy (anonymous):

24.1 thank you

OpenStudy (anonymous):

to the nearest tenth the answer is 24.2

OpenStudy (anonymous):

Hold on.

OpenStudy (anonymous):

You are awesome can you help me with others please i need this to graduate please

OpenStudy (anonymous):

That's not the answer yet.

OpenStudy (anonymous):

24.1 is the length of MP and not MN.

OpenStudy (anonymous):

or 24.2

OpenStudy (anonymous):

what do i do next :(

OpenStudy (anonymous):

Well since the length of MP is 24.2, and MP is the half of MN, what do you think you have to do?

OpenStudy (anonymous):

multiply?

OpenStudy (anonymous):

Multiply by what?

OpenStudy (anonymous):

2

jimthompson5910 (jim_thompson5910):

|dw:1417912760581:dw|

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