figure: ar-a2-segment.png A round lawn has a radius of 35 m…

Step 1. The sector. $\dfrac{1}{4} \times \dfrac{22}{7} \times 35^2 = \dfrac{1}{4} \times 3850 = 962.5\ \text{m}^2$.

Step 2. The triangle. $\dfrac{1}{2} \times 35 \times 35 = 612.5\ \text{m}^2$.

Step 3. The small part. $962.5 - 612.5 = 350\ \text{m}^2$.

Step 4. The large part. The lawn has an area of $3850\ \text{m}^2$. So the large part is $3850 - 350 = 3500\ \text{m}^2$.

Step 5. The cost. $350 \times 40 = 14\,000$ rupees.