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If isosceles ∆DEF has sides of length 11.5 and 13.7, which of the foll

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Joined: 02 Sep 2009
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If isosceles ∆DEF has sides of length 11.5 and 13.7, which of the foll  [#permalink]

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New post 25 Feb 2019, 02:03
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A
B
C
D
E

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  15% (low)

Question Stats:

91% (01:00) correct 9% (01:15) wrong based on 22 sessions

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Posts: 93
Re: If isosceles ∆DEF has sides of length 11.5 and 13.7, which of the foll  [#permalink]

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New post 25 Feb 2019, 02:31
Since ∆DEF is an isosceles triangle, the third side will be either of the length 11.5 or of the length 13.7..

If the third side is of the length 13.7, then perimeter is 11.5 + 13.7*2 = 38.9... not in the choices.

If the third side is of the length 11.5, then perimeter is 11.5*2+ 13.7 = 36.7..

Option B is the right answer.

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Re: If isosceles ∆DEF has sides of length 11.5 and 13.7, which of the foll   [#permalink] 25 Feb 2019, 02:31
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If isosceles ∆DEF has sides of length 11.5 and 13.7, which of the foll

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