Answer: 1.
- A 0
- B 1
- C pi/2
- D pi
Correct answer: B. 1
Explanation: [sin x] from 0 to pi/2 = sin(pi/2) - sin(0) = 1 - 0 = 1.
The exact area under the curve from a to b (shaded) is approximated by a few rectangles, the Riemann sum idea behind the definite integral.