Answer:
Second option:
[tex]d = 15.6\ mm,\ C = 49.01\ mm[/tex]
Step-by-step explanation:
We can observe that the radius of the circle is given. This is:
[tex]r = 7.8\ mm[/tex]
And the missing measures are the diameter of the circle and the circumference.
Since the diameter of a circle is twice the radius, we get that this is:
[tex]d=2r\\\\d=2(7.8\ mm)\\\\d=15.6\ mm[/tex]
To find the circumference of the circle, we can use this formula:
[tex]C=2\pi r[/tex]
Where "r" is the radius of the circle.
Substituting the radius into the formula, we get:
[tex]C=2\pi r\\\\C=2\pi (7.8\ mm)\\\\C=49.01\ mm[/tex]
