Question

A circular park of radius 42m has a 7m wide road around it. Find the cost of cementing the road at Rs12 per square metre. ​

Answer 1

Answer:

Radius of the park =r

Circumference of the park =2πr

176=2πr

r=2π176​

r=2×722​176​

r=2×22176×7​

r=28 m

Area of road =π(28+7)2−π(28)2

                     =π(352−282)

                     =722​(35−28)(35+28)

                     =722​×7×63

                     =1386 m2

Step-by-step explanation:

pls mark brainliest

Answer 2

Answer:

Area of the road = area of garden including road - area of garden

= π(49²-42²)

=π(2401-1764)

= 3.14×637=2000.18m²

1 m² cost =12

24024 rupee