mm007 wrote:

OA is B...

Here is the OE:

The formula for the sum of the interior angles of a non-convex polygon is (n â€“ 2)(180), where n represents the number of sides. To find the sum of the interior angles of the polygon then, we need to know the number of sides. We can therefore rephrase the question:

How many sides does the game board have?

(1) INSUFFICIENT: It tells us nothing about the number of sides. The sum of the exterior angles for any non-convex polygon is 360.

(2) SUFFICIENT: The sum of the exterior angles = 5 Ã— length of each spoke Ã— number of spokes.

360 = 5(8)(x)

360 = 40x

9 = x

The game board has nine sides. The sum of its interior angles is (9 â€“ 2)(180) = 1260.

The correct answer is B.

Got B too but in different way ;

(2) SUFFICIENT: The sum of the exterior angles = 5 Ã— length of each spoke Ã— number of spokes.

360 = 5(8)(x)

how did u get this 360 as sum of the exterior angles; (2) does not say that

unless you deduce it .