Juan is decorating a bulletin board in his classroom. He wants to put a piece of ribbon along the outer edge of the entire board.
If the bulletin board looks like the picture below, how many
inches of ribbon will he need to do the job?
32 inches
48 inches
80 inches
B
А
60 inches
C 160 inches
D
208 inches

Find a parametrization for the curve「and determine the work done on a particle moving along γ in r3 through the force field f: r^3--r^3'where f(x,y,z) = (1,-x,z) and (a) im (γ) is the line segment from (0,0,0) to (1,2,1) (b) im (γ) is the polygonal curve with successive vertices (1,0,0), (0,1,1), and (2,2,2) (c) im (γ) is the unit circle in the plane z = 1 with center (0,0,1) beginning and ending at (1,0,1), and starting towards (0,1,1)