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705-805 (Hard)|   Geometry|      
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fozzzy
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The longest straight line that can be inscribed in an isosce 20 Jul 2013, 05:41
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E
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85% (hard)

Question Stats:

41% (01:49) correct 59% (01:56) wrong based on 156 sessions

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The longest straight line that can be inscribed in an isosceles triangle with area 10 and no obtuse angles is

A. less than 5

B. greater than or equal to 5, but less than 7.5

C. greater than or equal to 7.5, but less than 10

D. greater than or equal to 10, but less than 20.

E. greater than 20.
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E
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The longest straight line that can be inscribed in an isosce 20 Jul 2013, 05:51
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Answer Option E.

No obtuse angle. Lets say its a right angled triangle with height 20 & base 1 (so area is 20X1X0.5). Definitely we can inscribe a line greater than 20. Or we can take the height as 40 & base as 0.5 too.
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The longest straight line that can be inscribed in an isosce 19 Aug 2013, 02:40
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Hi

How can the answer be E.
Doesn't the question says that its an isosceles triangle ??

Please help !!
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Bunuel
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The longest straight line that can be inscribed in an isosce 19 Aug 2013, 03:18
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ankitD
The longest straight line that can be inscribed in an isosceles triangle with area 10 and no obtuse angles is

A. less than 5
B. greater than or equal to 5, but less than 7.5
C. greater than or equal to 7.5, but less than 10
D. greater than or equal to 10, but less than 20.
E. greater than 20.

Hi

How can the answer be E.
Doesn't the question says that its an isosceles triangle ??

Please help !!
Show more

Consider the figure below:
Attachment:
Area.png
Area.png [ 2.51 KiB | Viewed 4198 times ]
Area=1/2*1/2*40=10 --> the longest straight line that can be inscribed > 40 > 20.

Hope it helps.
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The longest straight line that can be inscribed in an isosce 19 Aug 2013, 04:57
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fozzzy
The longest straight line that can be inscribed in an isosceles triangle with area 10 and no obtuse angles is

A. less than 5

B. greater than or equal to 5, but less than 7.5

C. greater than or equal to 7.5, but less than 10

D. greater than or equal to 10, but less than 20.

E. greater than 20.
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Let perpendicular = P
base = B

Now, 1/2 . B . P = 10
or, B . P = 20
Possibilities of the lengths B = 20 then P = 1
or, B = 200 And P = 1/10 Thus we can extract various values over 20 . So longest is more than 20 .
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The longest straight line that can be inscribed in an isosce 28 Mar 2016, 19:22
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tricky one..thanks bunuel for the picture..
I picked C..as I thought that max we can have is a 45-45-90 triangle..where the base=height...now i see..
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The longest straight line that can be inscribed in an isosce 01 Apr 2016, 02:12
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Asifpirlo
fozzzy
The longest straight line that can be inscribed in an isosceles triangle with area 10 and no obtuse angles is

A. less than 5

B. greater than or equal to 5, but less than 7.5

C. greater than or equal to 7.5, but less than 10

D. greater than or equal to 10, but less than 20.

E. greater than 20.

Let perpendicular = P
base = B

Now, 1/2 . B . P = 10
or, B . P = 20
Possibilities of the lengths B = 20 then P = 1
or, B = 200 And P = 1/10 Thus we can extract various values over 20 . So longest is more than 20 .
Show more

Did pretty much the same thing and got B.P = 20. But got confused as to what implication does the information "no obtuse angles" have. Can you please explain? Thank you.
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The longest straight line that can be inscribed in an isosce 16 Feb 2019, 03:04
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