BTGmoderatorDC wrote:What is the perimeter of isosceles triangle MNP?
(1) MN = 16
(2) NP = 20
OA E
Source: Official Guide
Target question: What is the perimeter of isosceles triangle MNP?
Statement 1: MN = 16
No idea about the other 2 sides
Statement 1 is NOT SUFFICIENT
Statement 2: NP = 20
No idea about the other 2 sides
Statement 2 is NOT SUFFICIENT
Statements 1 and 2 combined
Since we have an ISOSCELES triangle, we know that two sides have the same length, but which two sides?
There are two possible cases:
Case a: The side lengths are 16, 16, 20. In this case, the answer to the target question is
the perimeter = 16+16+20=52
Case b: The side lengths are 16, 20, 20. In this case, the answer to the target question is
the perimeter = 16+20+20=56
Since we cannot answer the
target question with certainty, the combined statements are NOT SUFFICIENT
Answer: E
Cheers,
Brent
