1. The rectangles in the graph below illustrate a
   ??? left endpoint right endpoint midpoint
   Riemann sum for $\displaystyle{ f(x) = 2 \sin x }$ on the interval $[0, \pi]$.
   The value of this Riemann sum is .

   Left endpoint Riemann sum for \( y = 2 \sin x \) on \( [0, \pi ]\)

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2. The rectangles in the graph below illustrate a
   ??? left endpoint right endpoint midpoint
   Riemann sum for $\displaystyle f(x) = 2 \sin x$ on the interval $\lbrack 0, \pi \rbrack$.
   The value of this Riemann sum is .

   Right endpoint Riemann sum for \( y = 2 \sin x \) on \( [0, \pi ]\)