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Mathematics 9 Online
OpenStudy (anonymous):

How do I find the hypotenuse of this triangle?

OpenStudy (anonymous):

.

OpenStudy (anonymous):

a^2+b^2=c^2

OpenStudy (anonymous):

ok what do the inside angles of a triangle add up to?

OpenStudy (anonymous):

180 degrees.

Directrix (directrix):

You need the 30-60-90 theorem. See attached information.

OpenStudy (anonymous):

is shows us already that there is a 90 and a 30 which means we need another 60 to get 180. so the top angle is 60, this is a 30 60 90 triangle which means there are no congruent sides

OpenStudy (anonymous):

^^^

OpenStudy (anonymous):

You could also use trig functions. \[\cos (30)=\frac{ 5\sqrt{3} }{ z }\] And just solve algebraically.

Directrix (directrix):

The 30-leg is the 60-leg divided by square root of 3.

OpenStudy (anonymous):

Use the cos rule. Cos(Theta)=Adjacent/Hypotenuse

OpenStudy (anonymous):

Basically 5root3 Divided by cos 30.

OpenStudy (anonymous):

My openstudy is getting buggy. If I don't reply for a while it's because it logged me out or something.

Directrix (directrix):

And, according to the theorem, the hypotenuse has length twice the 30-leg. We do not need right triangle trig here. See attached. @asher1027

Directrix (directrix):

>>>My openstudy is getting buggy. It is not just your OS that is getting buggy.

OpenStudy (agent0smith):

OS has been like this for weeks. It has worked properly much less often than it has worked poorly.

OpenStudy (anonymous):

OS as in operating system?

Directrix (directrix):

@asher1027 Did you read the 30-60-90 theorem I attached? You need to know that.

OpenStudy (agent0smith):

OS is openstudy.

OpenStudy (anonymous):

Yeah I read it. Thanks.

OpenStudy (anonymous):

Oh yeah, duh. haha

Directrix (directrix):

So, what did you get for the hypotenuse length?

OpenStudy (anonymous):

@agent0smith

OpenStudy (anonymous):

Is it 25?

Directrix (directrix):

No.

Directrix (directrix):

Look at this diagram.

Directrix (directrix):

^^^ It is an application of the 30-60-90 theorem.

OpenStudy (anonymous):

Ok, oops. I misread some of the previous instructions. That makes sense.

Directrix (directrix):

So, what is the length of the hypotenuse?

OpenStudy (anonymous):

10.

Directrix (directrix):

Yes, that is what I got.

OpenStudy (anonymous):

Thanks again. @Directrix

Directrix (directrix):

You are welcome.

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