Question

A circular pond has a perimeter of 31.42m. A bridge is to be built across the pond at the centre. A) How long is the bridge? B) A pavement of uniform width of 2.5m is built around the pond. The cost of pavement is $48/m² and the building cost of the bridge is $18/m. Find the total cost of building the bridge and the pavement.

Answer 1

Answer:

Step-by-step explanation:

the radius of the pond is 3.14*2*r=31.42

r=5.0031 aprox 5

diameter will be 10

length of the bridge is 10m

cost of building the bridge is 10*18/m=180 rs

are of pavement= pi*5^2-pi*(5-2.5)^2

3.14*5*5=78.5  3.14*2.5*2.5=19.625

78.5-19.625=58.875

cost of pavement =58.875*48=2826