The lawn is in the form of a rectangle with two semicircles on opposite ends of the width.

Area of the rectangle = 200m x 14m = 2800 sq. m

Radius of the semicircles = $\dfrac{14}{2}$ m = 7 m

Area of the two semicircles = $2\times\left(\dfrac{\pi R^{2}}{2}\right)$

=$ \dfrac{22}{7} \times 7 \times 7 $

= 154 sq. m.