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What is the area of the shaded region in the figure above, i [#permalink]
Can you pls explain why angle D is 30 degree?

cos theta = adjacent side/hypotenuse = √3a/2a = √3/2

cos 30 = √3/2
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Re: What is the area of the shaded region in the figure above, i [#permalink]
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AjanthaJ wrote:
gajala

Hi

Can you pls explain why angle D is 30 degree?


This might help.

Image

In the original question, the two given sides are in the same ratio as the 30-60-90 triangle.
This also tells us that the missing side must have length a
Image
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Re: What is the area of the shaded region in the figure above, i [#permalink]
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Thanks for the details sir.

Now I got it.

@greenlightprep
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Re: What is the area of the shaded region in the figure above, i [#permalink]
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