Question

pls help me fast .......​

Answer 1

Step-by-step explanation:

circumference of swimming pool=2πr

308=2πr

2πr=308

2×22/7 ×r=308

r=(308×7)/44

r=49

radius of swimming pool including path R=49+7=56

area of circular path =ar of swimming pool including path - ar of swimming pool excluding path

=πR^2 -πr^2

=22/7 ×56×56 - 22/7 × 49×49

=2310 m^2

therefore cost of paving path at 8 per m^2 = 2310×rs8=rs18480

Answer 2

Answer:

18480 rupees

Step-by-step explanation:

$width = 7m \\ 2\pi \: r = 308 \\ r = \frac{308 \times 7}{2 \times 22} \\ r1 = 49m \\ r2 = r1 + width \\ r2 = 49 + 7 \\ r2 = 56m \\area \: of \: path = \pi {r}^{2} \\ = \pi( {r2}^{2} - {r1}^{2} ) \\ = \frac{22}{7} ( {56}^{2} - {49}^{2} ) \\ = \frac{22}{7} (3136 - 2401) \\ = \frac{22}{7} \times 735 \\ \\ = 22 \times 105 \\ = 2310 {m}^{2} \times 8 \\ cost = rupees \: 18480$