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14 Jan 2022, 03:15
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B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
75%
(hard)
Question Stats:
56% (02:37) correct
44%
(02:17)
wrong
based on 88
sessions
History
Date
Time
Result
Not Attempted Yet
The area of a square ABCD symmetrically inscribed in a semicircle (center O) of radius 20 is:
(A) 300
(B) 320
(C) 360
(D) 380
(E) 400
Are You Up For the Challenge: 700 Level Questions
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19 Jan 2022, 21:55
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mirroring this image gives a rectangle with sides l=2a and b=a, inscribed in a circle with d=40
diagonal of the rectangle=diameter of the circle
(l^2+b^2)^-1/2= 40
4a^2+a^2=40^2 ==> a^2 (i.e. area of square)=1600/5=320
diagonal of the rectangle=diameter of the circle
(l^2+b^2)^-1/2= 40
4a^2+a^2=40^2 ==> a^2 (i.e. area of square)=1600/5=320
09 Apr 2022, 21:23
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Bunuel can you please help with this question?
