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What is the ratio of the area of ΔDEC to the area of square ABCD in th

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What is the ratio of the area of ΔDEC to the area of square ABCD in th  [#permalink]

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New post 11 Jan 2019, 02:08
00:00
A
B
C
D
E

Difficulty:

  25% (medium)

Question Stats:

75% (00:57) correct 25% (00:57) wrong based on 35 sessions

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Joined: 18 Aug 2017
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Re: What is the ratio of the area of ΔDEC to the area of square ABCD in th  [#permalink]

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New post 11 Jan 2019, 05:07
Bunuel wrote:
Image
What is the ratio of the area of ΔDEC to the area of square ABCD in the figure above?


A. 1/4

B. 1/3

C. 1/2

D. 2/1

E. It cannot be determined
Attachment:
2019-01-11_1306.png



let side of square be 4
so altitude of triangle = 4
area of triangle 0.5 * 4* 4/ 16 = 1/2 IMO C
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Re: What is the ratio of the area of ΔDEC to the area of square ABCD in th  [#permalink]

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New post 11 Jan 2019, 11:40
Area of square=DC^2
Area of triangle DEF=0.5*Base*Height
Here,B=H=DC
Hence.area of triangle DEF=0.5*Dc*DC

Thus, ratio of area of triangle DEF to area of square=(0.5*DC*DC)/(DC*DC)= 0.5=1/2
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Re: What is the ratio of the area of ΔDEC to the area of square ABCD in th   [#permalink] 11 Jan 2019, 11:40
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What is the ratio of the area of ΔDEC to the area of square ABCD in th

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