Question

The Canadian $2 coin has a copper centre surrounded by a ring of nickel. The diameter of the coin is 2.8 cm. The area of the copper centre is 2.0 cm2 . What is the area of the nickel ring

Answer 1

4.15

Explanation:

d = 2.8cm, a = 1.4cm

a = πr2

a = 3.14 * 1.42

a = 3.14 * 1.96

a = 6.15cm2

6.15 - 2 = 4.15

The area of the nickel ring is 6.15cm2

Answer 2

6.0 cm²

Explanation:

Area of the coin:

`A_c = d\pi\\\\A_c = 2.8\pi\approx8.8\ cm^2`

So area of the ring:

A = 8.8 - 2.0 = 6.0 cm²