I'm trying to reconstruct in my mind as best as I can what you mean.
i) For the area of the flowerbed, you can calculate the area of the rectangle, and then combine the two semicircles to make a circle and calculate the area that way. (or find the area of one half-circle and multiply by 2)
ii) This one is trickier. I'm assuming the semi-circles are positioned on the shorter ends of the rectangle. Hence the 'exposed' sides of the rectangle are 35 and 35 = 70. Now all we are left with is to calculate are the 'exposed' sides of each semi-circle.
but think about combining the two semi-circles again to make a full circle. do you know a formula which gives the perimeter of a circle with diameter 14?