Question

A circular piece of metal has a radius of 3.5 meters.

The metal sells for $3.25 per square meter.

What is the total cost of the circular piece of metal?

Answer 1

Answer: 125.01

Step-by-step explanation: After looking a bit harder at the question, You do not get 38.48 When you multiply 3.14 by 12.25, you actually get 38.465, once multiplied by 3.25, you will get the correct awnser of 125.01125, Or, 125.01.

Answer 2

1) we calculate the area of the circular piece of metal.
area=πr²
area=π(3.5 m)²=12.25π m² ≈ 38.48 m²

2)we calculate the total cost of the circular piece of meta by the rule of three.

$3.25-------------------1 m²
x--------------------------38.48 m²

x=($3.25 * 38.48m²) / 1 m²=125.06$

Answer: 125.06$

We can also calcultate the total cost of the ciucular piece of metal by the ratius.
Ratius=$3.25/1m²

Total cost=ratius * area of the circular piece of metal.
total cost=($3.25/ m²)*(38.48 m²)=$125.06

Answer: $125.06