Question

Please help me I get so confused

Answer 1

(a) 31.4 in (b) 37.68 mm

Explanation:

a- The circumference of a circle of radius r - or diameter d, is,

C=2
`\pi r`=
`\pi d`

In this case, we have that the diameter of the circle is d = 10in. If we use 3.14 for π, the circumference is,

`C=\pi xd=3.14x10in=31.4in`

b- - The question gives us a circle with a radius of 6mm and we are asked to find the circumference of the circle.

- To find the circumference of a circle, we simply need to apply the formula for finding the circumference of a circle.

- The formula for the circumference of a circle is:

C=2
`\pi`×r

where,

r=radius

C= circumference of the circle:

- Thus, we can find the circumference of the circle as follows

r= 6mm

`\pi`=3.14

C=2×3.14× 6mm

C= 37.68mm

Final Answer

The circumference of the circle is 37.68 mm

Answer 2

31.42

Explanation:

C=2πr

d= 2r

Solving for C

C = πd = π·10 ≈ 31.41593