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Which statement best explains why ben uses the width hi to create the arc at j from point k

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.

Miss henderson wants to build a fence around a rectangular garden in her backyard in the scale drawing the perimeter of the garden is 14 in of the actual length of a b is 20 ft how many feet of fencing what you need