Question

A circular city plaza is surrounded by a row of bricks. The area of the plaza is 1,520 square meters. How long is the row of bricks, to the nearest meter?

Answer 1

the answer is 138 meters

Explanation:

I work at the circular city plaza

Answer 2

138 meters

Explanation:

step 1

Find the radius of the circular city plaza

The area is equal to

`A=\pi r^(2)`

we have

`A=1,520\ m^2`

`\pi =3.14`

substitute

`1,520=(3.14)r^(2)`

solve for r

`r^2=1,520/3.14\\r=22\ m`

step 2

we know that

To find out how long is the row of bricks, determine the circumference of the circular city plaza

The circumference is equal to

`C=2\pi r`

we have

`r=22\ m`

`\pi =3.14`

substitute

`C=2(3.14)(22)=138\ m`