Question

Find the circumference if radius =26

Answer 1

If the radius is 26, firstly we have to calculate the diameter. The diameter is 2 times the radius.

Radius = 26

Diameter = 26 × 2 = 52

Circumference of circle = π × Diameter

= π × 52

= 163.3628 or 163.4 (to 1 dp)

Answer 2

Circumference can be found using $C=2\pi r$ formula. Where $r$ is radius.

Now we just put in the data.

$C=2\pi\times26=52\pi\approx\boxed{163.36}$