GRE Sample Test 4 Quantitative Reasoning 1

The figure shows a circle with diameter 8. The circumference of the circle is therefore 8π. Since the 90° central angle cuts a quarter of the circle, the length of arc QRS must likewise be a quarter of the circumference. Quantity A is therefore one-quarter of 8π, or 2π. Because π is a positive number, 2π must be greater than 2. Pick (A) Quantity A is greater.