Question

Area of a circle when the diameter is 10?

Answer 1

✦ Given that

• diameter = 10 units

✦ We need to find

• the area of the circle

Area of the Circle

`\longleftrightarrow\rm{A=\pi r^2}`

`\longleftrightarrow\rm{A=\pi *10^2}`

`\longleftrightarrow\rm{A=100\pi}`

`\longleftrightarrow\rm{A=314.16 \: units \: squared`

Therefore, the area is 314.16 units squared (rounded to 2 dp.)

Answer 2

78.54

Explanation:

Area of circle = pi*r^2

Diameter = 2r

2r = 10

r = 5

Area = pi*5^2 = pi*25

Area = 78.54