Question

The diameter of a circle is 3.6 m. Find the radius, circumference and area. Show your working.

Answer 1

The Radius is 1.8, The circumference is 11.3 ,The area is 10.2

Explanation:

The radius of a circle from diameter: if you know the diameter d , the radius is r = d / 2 .

To calculate the circumference, you need the radius of the circle: Multiply the radius by 2 to get the diameter. Multiply the result by π, or 3.14 for an estimation.That's it; you found the circumference of the circle.Or you can use the circle's diameter:Multiply the diameter by π, or 3.14.The result is the circle's circumference.


Diameter of circle= 3.6cm So, radius of circle=3.6/2Radius of circle = 1.8 Now ,Area of circle =πr². [r=radius] so 3.14 times 1.8 times 1.8 and you get 10.17 then round it to the nearest tenth and it is 10.2

Answer 2

Explanation:

Given :

d = 3.6m

r = d/2

r = 3.6/2

r = 1.8 m

We know that,

C = 2πr

C = 2 * 22/7 * 1.8

C = 11.3 m

Now,

A = π r²

A = 22/7 × (1.8)²

A = 22/7 × 3.24

A = 10.1 m²