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Mathematics 8 Online
OpenStudy (darkbeautystar):

Please Help! Will fan and medal! The green portion of the shape has an area of 50π square feet. What are the measures of the diagonals of the yellow Rhombus?

OpenStudy (darkbeautystar):

OpenStudy (anonymous):

Are there any choices?

OpenStudy (darkbeautystar):

No

OpenStudy (welshfella):

well we can find the area of the rhombus this = area of circle - 50 pi = (10pi)^2 * pi - 50pi

OpenStudy (darkbeautystar):

That = 2943.54803535

OpenStudy (welshfella):

it looks like the rhombus touches the circle so one diagonal would be = 20pi feet.

OpenStudy (darkbeautystar):

Ok I'm not sure where to add that in to the equation

OpenStudy (welshfella):

I cant get my head around this one , but it shouldn't be too difficult. I've got a mental block somehow..

OpenStudy (welshfella):

|dw:1458057498196:dw|

OpenStudy (darkbeautystar):

Ok

OpenStudy (darkbeautystar):

The triangle should be 20ft high

OpenStudy (welshfella):

Ah yes you can find the area of the triangle in terms of x and equate it to 1/2 the area of the rhombus so x * 10 pi = [ (10pi)^2 * pi - 50pi ] / 2 solve this for x The other diagonal = 2*x.

OpenStudy (darkbeautystar):

Ok so X=1471.77401768

OpenStudy (welshfella):

No - that is half the area of the rhombus

OpenStudy (darkbeautystar):

And then the other diagonal would be 2943.54803535

OpenStudy (welshfella):

No you need to solve for x

OpenStudy (darkbeautystar):

Well the first big number I put was what I solved for X

OpenStudy (darkbeautystar):

I just did exactly what you put

OpenStudy (darkbeautystar):

except for the *2

OpenStudy (darkbeautystar):

1471.77401768 is what I found for X using the equation you gave me!

OpenStudy (welshfella):

the 2943 was the area right You miscalculated there

OpenStudy (darkbeautystar):

Where does the 2943 fit into the equation?

OpenStudy (welshfella):

its 2943.55 - I apologise You were right x * 10 pi = 2943.55 / 2 x = 2943.55 / 10* pi

OpenStudy (darkbeautystar):

924.743505547

OpenStudy (darkbeautystar):

X=^

OpenStudy (welshfella):

Sorry I got called away again I made a mistake its 2943.55 / 2 * 10 * pi

OpenStudy (welshfella):

which i get to be 46.85

OpenStudy (darkbeautystar):

Ok so is that the final answer...

OpenStudy (darkbeautystar):

I thought we had more steps

OpenStudy (welshfella):

that is the value of x diagonal = 2x = 93.7

OpenStudy (darkbeautystar):

So the answer would be 93.7 cause i'm pretty sure it is asking for the measures of the diagonals of the rhombus.

OpenStudy (welshfella):

well one diagonal = diameter of the circle ( the longest one) check the diagram

OpenStudy (welshfella):

20 pi or 62.83 feet right?

OpenStudy (darkbeautystar):

No 20ft is what the diagram says

OpenStudy (darkbeautystar):

That line that goes across the circle and through the middle of the rhombus says 20ft

OpenStudy (welshfella):

OH i need glasses then our calculations are wrong

OpenStudy (darkbeautystar):

lol

OpenStudy (welshfella):

OK area of rhombus = 10^2 * pi - 50 pi = 50 pi right?

OpenStudy (welshfella):

this makes the calculation a lot easier

OpenStudy (welshfella):

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