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Mathematics 9 Online
OpenStudy (anonymous):

FAN N MEDAL

OpenStudy (anonymous):

ABCD is a rectangle. What is the value of x? rectangle with length 63 m, width x m, and diagonal 65 m 2 meters 16 meters 63 meters 65 meters

OpenStudy (anonymous):

TheSmartOne (thesmartone):

|dw:1448380596592:dw|

TheSmartOne (thesmartone):

Do you know Pythagorean Theorem? :)

OpenStudy (anonymous):

i think so

OpenStudy (anonymous):

i think the answer is 16 meters

TheSmartOne (thesmartone):

The Pythagorean Theorem is: \(\sf\Large a^2 + b^2 = c^2\) where a and b are the legs of a right triangle and c is the hypotenuse

OpenStudy (anonymous):

okay yes then i know what the Pythagorean theorem is

TheSmartOne (thesmartone):

So what is the hypotenuse in this question?

OpenStudy (anonymous):

i don't know

TheSmartOne (thesmartone):

|dw:1448380995888:dw|

OpenStudy (pyxieyt):

They are looking for the value of x! You would use the Pythagorean theorem still. \[63+?=65\] Do you know how to find the answer?

OpenStudy (anonymous):

2

OpenStudy (pyxieyt):

Wait! That is not the answer yet!

OpenStudy (anonymous):

oh okay

TheSmartOne (thesmartone):

@pyxieyt you're not doing it correct :/

OpenStudy (pyxieyt):

We would have to make it look like this \[A+63^2=65^2\]

OpenStudy (pyxieyt):

Yeah I realised that :P

TheSmartOne (thesmartone):

now that's kinda correct it has to be in the form \(\sf\Large a^2 + b^2 = c^2\) And after plugging in the numbers: \(\sf \Large a^2 + 63^2 = 65^2\)

OpenStudy (pyxieyt):

Now, what would be 63x63?

OpenStudy (pyxieyt):

What would be 65x65?

OpenStudy (anonymous):

it would be 4225 i think

TheSmartOne (thesmartone):

wha twould be 4225? :)

OpenStudy (anonymous):

65x65

OpenStudy (pyxieyt):

Okay so what is 63x63?

OpenStudy (anonymous):

it is 3969

OpenStudy (pyxieyt):

Okay so what is 4225-3969

OpenStudy (anonymous):

256

TheSmartOne (thesmartone):

and take the squareroot of that

TheSmartOne (thesmartone):

\(\sf\sqrt{256} = ?\)

OpenStudy (anonymous):

uhm.. 16?

TheSmartOne (thesmartone):

and that's your answer :)

OpenStudy (pyxieyt):

Yep! You got it correct!

OpenStudy (anonymous):

thank you so much both of you

OpenStudy (pyxieyt):

Good job!

TheSmartOne (thesmartone):

Anytime! :D

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