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Trapezoid

This topic has 1 expert reply and 1 member reply
vinay1983 Legendary Member
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Trapezoid

Post Sun Oct 06, 2013 8:38 am
If ABCD is a trapezoid, where AB is parallel to CD, what is the area of ABCD?

(1) 2(AB) + CD = 12

(2) The height of the trapezoid is 5 inches

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GMAT/MBA Expert

Post Sun Oct 06, 2013 9:37 am
vinay1983 wrote:

If ABCD is a trapezoid, where AB is parallel to CD, what is the area of ABCD?

(1) 2(AB) + CD = 12

(2) The height of the trapezoid is 5 inches
The area of the trapezoid is (average of the 2 "bases")(height)
In other words, area = [(AB+CD)/2][height]

Here are 2 trapezoids that satisfy the conditions in statements 1 and 2 combined.

Trapezoid A

Here, the area = 25

Trapezoid B

Here, the area = 22.5

Since we cannot answer the target question with certainty, the combined statements are NOT SUFFICIENT

Answer: E

Cheers,
Brent

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Last edited by Brent@GMATPrepNow on Thu Apr 19, 2018 2:09 pm; edited 1 time in total

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TheGmatTutor Senior | Next Rank: 100 Posts
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Post Tue Oct 08, 2013 8:48 am
The formula for the area of a trapezoid is (1/2)*(base1 + base2)*height. In other words, it's the average of the two bases times the height. In this problem, it would be

Area = (1/2)*(AB+CD)*height

S1. Does not tell you anything about the height; insufficient
S2. Does not tell you anything about the bases; insufficient

Together, you know that 2AB+CD = 12 and the height is 5; however, you don't know the average of the two bases AB and CD.

Answer: E

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