Question

what is the radius and diameter of each circle? a. b. c. radius = radius = diameter = diameter = d. e. 11 m 30 mm radius = radius = diameter = diameter = f. g. 18 km 1 m radius = radius = diameter = diameter = h. john has a round swimming pool. the distance from the center of the pool to the edge is 4 m. what is the diameter of johns pool?

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 radius $r = 5$ mm. Then diameter $d=2\times5$ mm = 10 mm.

Step3: Solve for part b

Given diameter $d = 12$ cm. Then radius $r=\frac{12}{2}$ cm = 6 cm.

Step4: Solve for part c

Given radius $r = 11$ m. Then diameter $d = 2\times11$ m=22 m.

Step5: Solve for part d

Given diameter $d = 30$ mm. Then radius $r=\frac{30}{2}$ mm = 15 mm.

Step6: Solve for part e

Given diameter $d = 18$ km. Then radius $r=\frac{18}{2}$ km = 9 km.

Step7: Solve for part f

Given radius $r = 1$ m. Then diameter $d=2\times1$ m = 2 m.

Answer:

a. radius = 5 mm, diameter = 10 mm
b. radius = 6 cm, diameter = 12 cm
c. radius = 11 m, diameter = 22 m
d. radius = 15 mm, diameter = 30 mm
e. radius = 9 km, diameter = 18 km
f. radius = 1 m, diameter = 2 m