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In the figure above triangles ABC and MNP are both isosceles [#permalink]
14 Feb 2012, 06:59

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Difficulty:

45% (medium)

Question Stats:

65% (03:20) correct
34% (02:54) wrong based on 47 sessions

Attachment:

Triangle.PNG [ 33.97 KiB | Viewed 1998 times ]

In the figure above, triangles ABC and MNP are both isosceles. AB is parallel to MN, BC is parallel to NP, the length of AC is 7 and the length of BY is 4. If the area of the unshadd region is equal to the area of the shaded region, what is the length of MP?

In the figure above, triangles ABC and MNP are both isosceles. AB is parallel to MN, BC is parallel to NP, the length of AC is 7 and the length of BY is 4. If the area of the unshadd region is equal to the area of the shaded region, what is the length of MP?

A. 2\sqrt{2}

B. 2\sqrt{7}

C. \frac{2\sqrt{3}}{3}

D. \frac{7\sqrt{2}}{2}

E. \frac{7\sqrt{3}}{3}

Since the area of unshaded region is equal to the are of shaded region, then the area of the big triangle is twice the area of the little triangle (unshaded region): \frac{AREA_{ABC}}{area_{MNP}}=\frac{2}{1}

Next, triangles ABC and MNP are similar. In two similar triangles, the ratio of their areas is the square of the ratio of their sides: \frac{AREA}{area}=\frac{S^2}{s^2}. Thus \frac{AREA_{ABC}}{area_{MNP}}=\frac{AC^2}{MP^2} --> \frac{2}{1}=\frac{7^2}{MP^2} --> MP^2=\frac{7^2}{2} --> MP=\frac{7}{\sqrt{2}}=\frac{7\sqrt{2}}{2}.

In the figure below, triangles ABC and MNP are both isoceles. AB is parallel to MN, BC is parallel to NP, the length of AC is 7 and the length of BY is 4. If the area of the unshaded region is equal to the area of the shaded region, what is the length of MP?

In the figure below, triangles ABC and MNP are both isoceles. AB is parallel to MN, BC is parallel to NP, the length of AC is 7 and the length of BY is 4. If the area of the unshaded region is equal to the area of the shaded region, what is the length of MP?

Since the area of unshaded region is equal to the area of shaded region, then the area of the big triangle is twice the area of the little triangle (unshaded region): \frac{AREA_{ABC}}{area_{MNP}}=\frac{2}{1}

Since the area of unshaded region is equal to the area of shaded region, then the area of the big triangle is twice the area of the little triangle (unshaded region): \frac{AREA_{ABC}}{area_{MNP}}=\frac{2}{1}

How did you get the above?

Unshaded+Shaded=ABC --> since Unshaded=Shaded then Unshaded+Unshaded=ABC --> 2*Unshaded=ABC --> ABC/Unshaded=2/1 --> ABC/MNP=2/1.

Re: In the figure above triangles ABC and MNP are both isosceles [#permalink]
26 Sep 2013, 10:56

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