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Geometry 7 Online
OpenStudy (anonymous):

Mmmm Someone Help Please. A parallelogram has the vertices (0, 3), (3, 0), (0, -3) and (-3, 0). Determine what type of parallelogram. Find the perimeter and area.

OpenStudy (solomonzelman):

The parallelogram (to my understanding) just looks like normal parallelogram, so I don't understand what you are referring to a type of a parallelogram? Perhaps you mean rhombus, square or rectangle. For area you do, ` base × height `

OpenStudy (solomonzelman):

and for perimeter, add all sides of it.

OpenStudy (anonymous):

Yess I got the type of parallelogram and perimeter but i dont know hot to find the area

OpenStudy (anonymous):

How*

OpenStudy (anonymous):

All sides are 4 units long and they add up to 16 so I know that is the perimeter & for the type of parallelogram I put Rhombus cus thats what it looks like

OpenStudy (solomonzelman):

Have you graphed it?

OpenStudy (anonymous):

Yess I know the base is 4 but the height is what we dont know

OpenStudy (solomonzelman):

You can see that each side here is like this,|dw:1405860250713:dw|

OpenStudy (anonymous):

I don't understand.

OpenStudy (solomonzelman):

|dw:1405860323156:dw|

OpenStudy (solomonzelman):

https://www.desmos.com/calculator/w5yzw1rijb

OpenStudy (solomonzelman):

these are the points.

OpenStudy (solomonzelman):

Do you understand what I am saying about each side of the parallelogram?

OpenStudy (anonymous):

Yeah I understand that. But what im looking for is the height.

OpenStudy (solomonzelman):

you are first looking for each side, to find the correct perimeter. Your shape is a rhombus, but it is a square (you know what I mean right?)

OpenStudy (solomonzelman):

Can you tell me the exact value of each side (before we go ahead and solve for the area?)

OpenStudy (anonymous):

it's 4.

OpenStudy (solomonzelman):

No

OpenStudy (solomonzelman):

|dw:1405860959884:dw| So if the leg (not the hypotenuse) was 3, then what would the hypotenuse be equal to ?

OpenStudy (anonymous):

3 times the square root of 2

OpenStudy (anonymous):

right?

OpenStudy (solomonzelman):

yes, each side is 3√2 So then the perimeter is equal to ...?

OpenStudy (solomonzelman):

the perimeter of a square is ` side × 4 `

OpenStudy (anonymous):

12 times the square root of 2?

OpenStudy (solomonzelman):

Yes, bingo :)

OpenStudy (solomonzelman):

Can you find the area ?

OpenStudy (anonymous):

No.

OpenStudy (solomonzelman):

area of a square = ` side ²`

OpenStudy (anonymous):

But how do you square that

OpenStudy (solomonzelman):

you can see a square (it is rotated 45 degrees, but the shape itself is still a square) You know that each side of THIS square is ` 3√2 ` Area of a square = ` side × side ` (which is same as, ` side ² ` )

OpenStudy (solomonzelman):

SO the area is ??

OpenStudy (anonymous):

9 times the square root of 2

OpenStudy (solomonzelman):

Close, but what you need to do here is 3√2 × 3√2

OpenStudy (solomonzelman):

this means that you multiply 3√2 first by 3 and then times √2 (not just 3√2 × 3)

OpenStudy (anonymous):

9 times the quare root of 4?

OpenStudy (solomonzelman):

yes, this is correct... but just one more thing, you know that 4 is a perfect square (as 2² =4 ) So, 9 × √4 is same as saying 9 × ___ ?

OpenStudy (solomonzelman):

√4 is equal to what number ?

OpenStudy (anonymous):

is equal to 2 so iit's 18?

OpenStudy (solomonzelman):

Yes, the area is 18 :) Just to RVW, we got type of a parallelogram -> square (I would say) I think that rhombus would be correct too. Perimeter -> 12√2 Area -> 18

OpenStudy (anonymous):

Alright, Thank You! :)

OpenStudy (solomonzelman):

Anytime !

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