Question

radius and diameter
what is the radius and diameter of each circle?
a.
radius =
diameter =
b.
radius =
diameter =
c.
radius =
diameter =
d.
radius =
diameter =

Explanation:

Step1: Recall the relationship between radius and diameter

The diameter $d$ of a circle is twice the radius $r$, i.e., $d = 2r$ and $r=\frac{d}{2}$.

Step2: Solve for part a

Given $r = 5$ mm. Using $d = 2r$, we have $d=2\times5$ mm$ = 10$ mm.
radius = 5 mm, diameter = 10 mm

Step3: Solve for part b

Given $d = 12$ cm. Using $r=\frac{d}{2}$, we have $r=\frac{12}{2}$ cm$ = 6$ cm.
radius = 6 cm, diameter = 12 cm

Step4: Solve for part c

Given $r = 9$ m. Using $d = 2r$, we have $d=2\times9$ m$ = 18$ m.
radius = 9 m, diameter = 18 m

Step5: Solve for part d

Given $d = 16$ km. Using $r=\frac{d}{2}$, we have $r=\frac{16}{2}$ km$ = 8$ km.
radius = 8 km, diameter = 16 km

Answer:

a. radius = 5 mm, diameter = 10 mm
b. radius = 6 cm, diameter = 12 cm
c. radius = 9 m, diameter = 18 m
d. radius = 8 km, diameter = 16 km