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Geometry

Since you know AG = 3CE and DG = 3DE ...eq(1), Now the area of the top most triangle(CDE) =1/2(EC x DE) = 42 ...eq(2) (given) And Now, consider the area of the entire triangle(ADG) = 1/2(AG x DG) = 1/2(3EC x 3DE)-------- replace the values using (eq(1)) = 9/2(EC x DE) = 9(1/2(EC x DE)) ---eq(3)--- i...

by Ferguson259

Wed Sep 19, 2018 1:16 am
Forum: GMAT Math
Topic: Geometry
Replies: 5
Views: 26565

Theorem: If n is an odd integer, then n2 is an odd integer. Proof: Since n is an odd integer, there exists an integer k such that n=2k+1. Therefore, n2 = (2k+1)2 = 4k2+4k+1 = 2(2k2+2k)+1

mobdro

by Ferguson259

Mon Sep 17, 2018 1:12 am
Forum: Data Sufficiency
Topic: If n is an integer, is (n+1)^2 an even integer?
Replies: 4
Views: 780